January 25, 2007 Certificate Evidencing Fixed/Floating Rate CapitalSecurities of First California Capital Trust I (liquidation amount $1,000 per Capital Security)

Exhibit 4.1

THIS CAPITAL SECURITY IS A GLOBAL SECURITY WITHIN THE MEANING OF THE DECLARATION HEREINAFTER REFERRED TO AND IS REGISTERED IN THE NAME OF THE DEPOSITORY TRUST COMPANY (“DTC”) OR A NOMINEE OF DTC.  THIS CAPITAL SECURITY IS EXCHANGEABLE FOR CAPITAL SECURITIES REGISTERED IN THE NAME OF A PERSON OTHER THAN DTC OR ITS NOMINEE ONLY IN THE LIMITED CIRCUMSTANCES DESCRIBED IN THE DECLARATION, AND NO TRANSFER OF THIS CAPITAL SECURITY (OTHER THAN A TRANSFER OF THIS CAPITAL SECURITY AS A WHOLE BY DTC TO A NOMINEE OF DTC OR BY A NOMINEE OF DTC TO DTC OR ANOTHER NOMINEE OF DTC) MAY BE REGISTERED EXCEPT IN LIMITED CIRCUMSTANCES.

UNLESS THIS CAPITAL SECURITY IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF DTC TO FIRST CALIFORNIA CAPITAL TRUST I OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY CAPITAL SECURITY ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT HEREON IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”), ANY STATE SECURITIES LAWS OR ANY OTHER APPLICABLE SECURITIES LAW.  NEITHER THIS SECURITY NOR ANY INTEREST OR PARTICIPATION HEREIN MAY BE REOFFERED, SOLD, ASSIGNED, TRANSFERRED, PLEDGED, ENCUMBERED OR OTHERWISE DISPOSED OF IN THE ABSENCE OF SUCH REGISTRATION OR UNLESS SUCH TRANSACTION IS EXEMPT FROM, OR NOT SUBJECT TO, THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT AND ANY APPLICABLE STATE SECURITIES LAWS.  THE HOLDER OF THIS SECURITY BY ITS ACCEPTANCE HEREOF AGREES TO OFFER, SELL OR OTHERWISE TRANSFER THIS SECURITY ONLY (A) TO THE SPONSOR OR THE TRUST, (B) PURSUANT TO A REGISTRATION STATEMENT THAT HAS BEEN DECLARED EFFECTIVE UNDER THE SECURITIES ACT, (C) TO A PERSON WHOM THE SELLER REASONABLY BELIEVES IS A QUALIFIED INSTITUTIONAL BUYER IN A TRANSACTION MEETING THE REQUIREMENTS OF RULE 144A SO LONG AS THIS SECURITY IS ELIGIBLE FOR RESALE PURSUANT TO RULE 144A IN ACCORDANCE WITH RULE 144A, (D) TO A NON-U.S. PERSON IN AN OFFSHORE TRANSACTION IN ACCORDANCE WITH RULE 903 OR RULE 904 (AS APPLICABLE) OF REGULATION S UNDER THE SECURITIES ACT, (E) TO AN INSTITUTIONAL “ACCREDITED INVESTOR” WITHIN THE MEANING OF SUBPARAGRAPH (A) OF RULE 501 UNDER THE SECURITIES ACT THAT IS ACQUIRING THIS CAPITAL SECURITY FOR ITS OWN ACCOUNT, OR FOR THE ACCOUNT OF SUCH AN INSTITUTIONAL ACCREDITED INVESTOR FOR INVESTMENT PURPOSES AND NOT WITH A VIEW TO, OR FOR OFFER OR SALE IN CONNECTION WITH, ANY DISTRIBUTION IN VIOLATION OF THE SECURITIES ACT, OR (F) PURSUANT TO ANY OTHER AVAILABLE EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT, SUBJECT TO THE SPONSOR’S AND THE TRUST’S RIGHT PRIOR TO ANY SUCH OFFER, SALE OR TRANSFER TO REQUIRE THE DELIVERY OF AN OPINION OF COUNSEL, CERTIFICATION AND/OR OTHER INFORMATION SATISFACTORY TO EACH OF THEM IN ACCORDANCE WITH THE DECLARATION OF TRUST, A COPY OF WHICH MAY BE OBTAINED FROM THE SPONSOR OR THE TRUST.  HEDGING TRANSACTIONS INVOLVING THIS SECURITY MAY NOT BE CONDUCTED UNLESS IN COMPLIANCE WITH THE SECURITIES ACT.

THE HOLDER OF THIS SECURITY BY ITS ACCEPTANCE HEREOF ALSO AGREES, REPRESENTS AND WARRANTS THAT IT IS NOT AN EMPLOYEE BENEFIT, INDIVIDUAL RETIREMENT ACCOUNT OR OTHER PLAN OR ARRANGEMENT SUBJECT TO TITLE I OF THE EMPLOYEE RETIREMENT INCOME SECURITY ACT OF 1974, AS AMENDED (“ERISA”), OR SECTION 4975 OF THE INTERNAL REVENUE CODE OF 1986, AS AMENDED (THE “CODE”) (EACH A “PLAN”), OR AN ENTITY WHOSE UNDERLYING ASSETS INCLUDE “PLAN ASSETS” BY REASON OF ANY PLAN’S INVESTMENT IN THE ENTITY, AND NO PERSON INVESTING “PLAN ASSETS” OF ANY PLAN MAY ACQUIRE OR HOLD THE SECURITIES OR ANY INTEREST THEREIN, UNLESS SUCH PURCHASER OR HOLDER IS ELIGIBLE FOR EXEMPTIVE RELIEF AVAILABLE UNDER U.S. DEPARTMENT OF LABOR PROHIBITED TRANSACTION CLASS EXEMPTION 96-23, 95-60, 91-38, 90-1 OR 84-14 OR ANOTHER APPLICABLE EXEMPTION OR ITS PURCHASE AND HOLDING OF THIS SECURITY IS NOT PROHIBITED BY SECTION 406 OF ERISA OR SECTION 4975 OF THE CODE WITH RESPECT TO SUCH PURCHASE OR HOLDING.  ANY PURCHASER OR HOLDER OF THE SECURITIES OR ANY INTEREST THEREIN WILL BE DEEMED TO HAVE REPRESENTED BY ITS PURCHASE AND HOLDING THEREOF THAT EITHER (I) IT IS NOT AN EMPLOYEE BENEFIT PLAN WITHIN THE MEANING OF SECTION 3(3) OF ERISA, OR A PLAN TO WHICH SECTION 4975 OF THE CODE IS APPLICABLE, A TRUSTEE OR OTHER PERSON ACTING ON BEHALF OF AN EMPLOYEE BENEFIT PLAN OR PLAN, OR ANY OTHER PERSON OR ENTITY USING THE ASSETS OF ANY EMPLOYEE BENEFIT PLAN OR PLAN TO FINANCE SUCH PURCHASE, OR (II) SUCH PURCHASE WILL NOT RESULT IN A PROHIBITED TRANSACTION UNDER SECTION 406 OF ERISA OR SECTION 4975 OF THE CODE FOR WHICH THERE IS NO APPLICABLE STATUTORY OR ADMINISTRATIVE EXEMPTION.

THIS SECURITY WILL BE ISSUED AND MAY BE TRANSFERRED ONLY IN BLOCKS HAVING A LIQUIDATION AMOUNT OF NOT LESS THAN $100,000.00 (100 SECURITIES) AND MULTIPLES OF $1,000.00 IN EXCESS THEREOF.  ANY ATTEMPTED TRANSFER OF SECURITIES IN A BLOCK HAVING A LIQUIDATION AMOUNT OF LESS THAN $100,000.00 SHALL BE DEEMED TO BE VOID AND OF NO LEGAL EFFECT WHATSOEVER.

THE HOLDER OF THIS SECURITY AGREES THAT IT WILL COMPLY WITH THE FOREGOING RESTRICTIONS.

IN CONNECTION WITH ANY TRANSFER, THE HOLDER WILL DELIVER TO THE REGISTRAR AND TRANSFER AGENT SUCH CERTIFICATES AND OTHER INFORMATION AS MAY BE REQUIRED BY THE DECLARATION TO CONFIRM THAT THE TRANSFER COMPLIES WITH THE FOREGOING RESTRICTIONS.

January 25, 2007

Certificate Evidencing Fixed/Floating Rate Capital Securities

of

First California Capital Trust I

(liquidation amount $1,000 per Capital Security)

First California Capital Trust I, a statutory trust created under the laws of the State of Delaware (the “Trust”), hereby certifies that Cede & Co. (the “Holder”) is the registered owner of capital securities of the Trust representing undivided beneficial interests in the

assets of the Trust, (liquidation amount $1,000 per capital security) (the “Capital Securities”).  Subject to the Declaration (as defined below), the Capital Securities are transferable on the books and records of the Trust in person or by a duly authorized attorney, upon surrender of this Certificate duly endorsed and in proper form for transfer.  The Capital Securities represented hereby are issued pursuant to, and the designation, rights, privileges, restrictions, preferences and other terms and provisions of the Capital Securities shall in all respects be subject to, the provisions of the Amended and Restated Declaration of Trust of the Trust dated as of January 25, 2007, among Scott A. Montgomery and David R. Brown, as Administrators, Wilmington Trust Company, as Delaware Trustee, Wilmington Trust Company, as Institutional Trustee, National Mercantile Bancorp, as Sponsor, and the holders from time to time of undivided beneficial interests in the assets of the Trust, including the designation of the terms of the Capital Securities as set forth in Annex I to such amended and restated declaration as the same may be amended from time to time (the “Declaration”).  Capitalized terms used herein but not defined shall have the meaning given them in the Declaration. The Holder is entitled to the benefits of the Guarantee to the extent provided therein. The Sponsor will provide a copy of the Declaration, the Guarantee, and the Indenture to the Holder without charge upon written request to the Sponsor at its principal place of business.

Upon receipt of this Security, the Holder is bound by the Declaration and is entitled to the benefits thereunder.

By acceptance of this Security, the Holder agrees to treat, for United States federal income tax purposes, the Debentures as indebtedness and the Capital Securities as evidence of beneficial ownership in the Debentures.

This Capital Security is governed by, and construed in accordance with, the laws of the State of Delaware, without regard to principles of conflict of laws.

Signature appears on following page

IN WITNESS WHEREOF, the Trust has duly executed this certificate.

CERTIFICATE OF AUTHENTICATION

This is one of the Capital Securities referred to in the within-mentioned Declaration.

REVERSE OF CAPITAL SECURITY

Distributions payable on each Capital Security will be payable at an annual rate equal to [RATE]% beginning on (and including) the date of original issuance and ending on (but excluding) the Distribution Payment Date in March 2012 and at an annual rate for each successive period beginning on (and including) the Distribution Payment Date in March 2012, and each succeeding Distribution Payment Date, and ending on (but excluding) the next succeeding Distribution Payment Date (each a “Distribution Period”), equal to 3-Month LIBOR, determined as described below, plus 1.60% (the “Coupon Rate”), applied to the stated liquidation amount of $1,000.00 per Capital Security, such rate being the rate of interest payable on the Debentures to be held by the Institutional Trustee. Distributions in arrears will bear interest thereon compounded quarterly at the Distribution Rate (to the extent permitted by applicable law).  The term “Distributions” as used herein includes cash distributions and any such compounded distributions unless otherwise noted.  A Distribution is payable only to the extent that payments are made in respect of the Debentures held by the Institutional Trustee and to the extent the Institutional Trustee has funds available therefor.  As used herein, “Determination Date” means the date that is two London Banking Days (i.e., a business day in which dealings in deposits in U.S. dollars are transacted in the London interbank market) preceding the commencement of the relevant Distribution Period.  The amount of the Distribution payable (i) for any Distribution Period commencing on or after the date of original issuance but before the Distribution Payment Date in March 2012 will be computed on the basis of a 360-day year of twelve 30-day months, and (ii) for the Distribution Period commencing on the Distribution Payment Date in March 2012 and each succeeding Distribution Period will be calculated by applying the Distribution Rate to the stated liquidation amount outstanding at the commencement of the Distribution Period on the basis of the actual number of days in the Distribution Period concerned divided by 360.

“3-Month LIBOR” as used herein, means the London interbank offered interest rate for three-month U.S. dollar deposits determined by the Debenture Trustee in the following order of priority:  (i) the rate (expressed as a percentage per annum) for U.S. dollar deposits having a three-month maturity that appears on Telerate Page 3750 as of 11:00 a.m. (London time) on the related Determination Date (“Telerate Page 3750” means the display designated as “Page 3750” on the Moneyline Telerate Service or such other page as may replace Page 3750 on that service or such other service or services as may be nominated by the British Bankers’ Association as the information vendor for the purpose of displaying London interbank offered rates for U.S. dollar deposits); (ii) if such rate cannot be identified on the related Determination Date, the Debenture Trustee will request the principal London offices of four leading banks in the London interbank market to provide such banks’ offered quotations (expressed as percentages per annum) to prime banks in the London interbank market for U.S. dollar deposits having a three-month maturity as of 11:00 a.m. (London time) on such Determination Date.  If at least two quotations are provided, 3-Month LIBOR will be the arithmetic mean of such quotations; (iii) if fewer than two such quotations are provided as requested in clause (ii) above, the Debenture Trustee will request four major New York City banks to provide such banks’ offered quotations (expressed as percentages per annum) to leading European banks for loans in U.S. dollars as of 11:00 a.m. (London time) on such Determination Date.  If at least two such quotations are provided, 3-Month LIBOR will be the arithmetic mean of such quotations; and (iv) if fewer than two such quotations are provided as requested in clause (iii) above, 3-Month LIBOR will be a 3-Month LIBOR determined with respect to the Distribution Period immediately preceding such current Distribution Period.  If the rate for U.S. dollar deposits having a three-month maturity that initially appears on Telerate Page 3750 as of 11:00 a.m. (London time) on the related Determination Date is superseded on the Telerate Page 3750 by a corrected rate by 12:00 noon (London time) on such Determination Date, then the corrected rate as so substituted on the applicable page will be the applicable 3-Month LIBOR for such Determination Date.

The Distribution Rate for any Distribution Period will at no time be higher than the maximum rate then permitted by New York law as the same may be modified by United States law.

All percentages resulting from any calculations on the Capital Securities will be rounded, if necessary, to the nearest one hundred-thousandth of a percentage point, with five one-millionths of a percentage point rounded upward (e.g., 9.876545% (or ..09876545) being rounded to 9.87655% (or .0987655), and all dollar amounts used in or resulting from such calculation will be rounded to the nearest cent (with one-half cent being rounded upward)).

Except as otherwise described below, Distributions on the Capital Securities will be cumulative, will accrue from the date of original issuance and will be payable quarterly in arrears on March 15, June 15, September 15 and December 15 of each year or if any such day is not a Business Day, then the next succeeding Business Day (each such day, a “Distribution Payment Date”) (it being understood that interest accrues for any such non-Business Day during the applicable Distribution Period, beginning on or after March 15, 2012), commencing on the Distribution Payment Date in March 2007.  The Debenture Issuer has the right under the Indenture to defer payments of interest on the Debentures, so long as no Acceleration Event of Default has occurred and is continuing, by extending the interest payment period for up to 20 consecutive quarterly periods (each an “Extension Period”) at any time and from time to time on the Debentures, subject to the conditions described below, during which Extension Period no interest shall be due and payable.  During any Extension Period, interest will continue to accrue on the Debentures, and interest on such accrued interest will accrue at an annual rate equal to the Distribution Rate in effect for each such Extension Period, compounded quarterly from the date such interest would have been payable were it not for the Extension Period, to the extent permitted by law (such interest referred to herein as “Additional Interest”). No Extension Period may end on a date other than a Distribution Payment Date. At the end of any such Extension Period, the Debenture Issuer shall pay all interest then accrued and unpaid on the Debentures (together with Additional Interest thereon); provided, however, that no Extension Period may extend beyond the Maturity Date.  Prior to the termination of any Extension Period, the Debenture Issuer may further extend such period, provided that such period together with all such previous and further consecutive extensions thereof shall not exceed 20 consecutive quarterly periods, or extend beyond the Maturity Date. Upon the termination of any Extension Period and upon the payment of all accrued and unpaid interest and Additional Interest, the Debenture Issuer may commence a new Extension Period, subject to the foregoing requirements.  No interest or Additional Interest shall be due and payable during an Extension Period, except at the end thereof, but each installment of interest that would otherwise have been due and payable during such Extension Period shall bear Additional Interest.  During any Extension Period, Distributions on the Capital Securities shall be deferred for a period equal to the Extension Period.  If Distributions are deferred, the Distributions due shall be paid on the date that the related Extension Period terminates, to Holders of the Securities as they appear on the books and records of the Trust on the record date immediately preceding such date. Distributions on the Securities must be paid on the dates payable (after giving effect to any Extension Period) to the extent that the Trust has funds available for the payment of such distributions in the Property Account of the Trust.  The Trust’s funds available for Distribution to the Holders of the Securities will be limited to payments received from the Debenture Issuer.  The payment of Distributions out of moneys held by the Trust is guaranteed by the Guarantor pursuant to the Guarantee.

The Capital Securities shall be redeemable as provided in the Declaration.

ASSIGNMENT

FOR VALUE RECEIVED, the undersigned assigns and transfers this Capital Security Certificate to:

(Sign exactly as your name appears on the other side of this Capital Security Certificate)

Signature Guarantee(1)

(1)           Signature must be guaranteed by an “eligible guarantor institution” that is a bank, stockbroker, savings and loan association or credit union meeting the requirements of the Security registrar, which requirements include membership or participation in the Securities Transfer Agents Medallion Program (“STAMP”) or such other “signature guarantee program” as may be determined by the Security registrar in addition to, or in substitution for, STAMP, all in accordance with the Securities Exchange Act of 1934, as amended.