Document:

Exhibit
4.1

 

	NUMBER

                                                                                              

        MCADU
	 	UNITS

 

MOUNTAIN
    CREST ACQUISITION CORP. II

 

	SEE REVERSE FOR

        CERTAIN DEFINITIONS
		CUSIP 62402D
204 

 

UNITS
CONSISTING OF ONE SHARE OF COMMON STOCK AND

ONE RIGHT TO RECEIVE ONE-TENTH OF ONE SHARE OF COMMON STOCK

 

THIS CERTIFIES THAT _________________________________________________________________________ is the owner of  _________________________________________________________________________ Units.

 

Each
Unit (“Unit”) consists of one (1) share of common stock, par value $0.0001 per share (“Common
Stock”), of Mountain Crest Acquisition Corp. II, a Delaware corporation (the “Company”)
and one right (the “Right(s)”). Every ten Rights entitles the holder thereof to receive one share of
Common Stock upon the consummation of an the Company’s completion of a merger, share exchange, asset acquisition, stock
purchase, recapitalization, reorganization or other similar business combination (“Business Combination”).
The Common Stock and Rights comprising the Units represented by this certificate are not transferable separately prior to the
90th day after the date of the prospectus relating to the closing of the Company’s initial public offering (“IPO”),
subject to earlier separation in the discretion of Chardan Capital Markets, LLC, provided that the Company has filed with the
Securities and Exchange Commission a Current Report on Form 8-K which includes an audited balance sheet reflecting the Company’s
receipt of the gross proceeds of the IPO and issued a press release announcing when separate trading will begin. The terms of
the Rights are governed by a rights agreement (the “Rights Agreement”), dated as of [●], 2021,
between the Company and Continental Stock Transfer & Trust Company, as the rights agent, and is subject to the terms and provisions
contained therein, all of which terms and provisions the holder of this certificate consents to by acceptance hereof. A
copy of the Rights Agreement is on file at the office of Continental Stock Transfer & Trust Company at 1 State Street, New
York, New York 10004 and is available to Rights holder on written request and without cost.

 

This
certificate is not valid unless countersigned by the Transfer Agent and Registrar of the Company.

 

Witness
the facsimile seal of the Company and the facsimile signatures of its duly authorized officers.

 

 

	By	 	 	 
	 	Chairman of the Board	 	Chief Executive Officer

 

     

     

    

 

Mountain
Crest Acquisition Corp. II

 

The
Company will furnish without charge to each stockholder who so requests, a statement of the powers, designations, preferences
and relative, participating, optional or other special rights of each class of stock or series thereof of the Company and the
qualifications, limitations, or restrictions of such preferences and/or rights.

 

The
following abbreviations, when used in the inscription on the face of this certificate, shall be construed as though they were
written out in full according to applicable laws or regulations:

 

	TEN COM	—	as tenants in common	 	UNIF GIFT MIN ACT	—	 	Custodian	 
	 	 	 	 	 	 	(Cust)	 	(Minor)
	TEN ENT	—	as tenants by the entireties	 	 	 		 	
	 	 	 	 	 	 	 	 	 
	JT TEN	—	as joint tenants with right of survivorship
    and not as tenants in common	 	 	under
    Uniform Gifts to Minors Act
	 	 	 	 	(State)

 

Additional
abbreviations may also be used though not in the above list.

 

	For
    value received, ___________________________ hereby sell, assign and transfer unto

 

 

	PLEASE
    INSERT SOCIAL SECURITY OR OTHER

    IDENTIFYING NUMBER OF ASSIGNEE	 
	 	 
	 	 

 

 

	(PLEASE
    PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE)
	 

____________________________________________________________________________ Units
represented by the within Certificate, and do hereby irrevocably constitute and
appoint

 

____________________________________________________________________________ Attorney to transfer
the said Units on the books of the within named Company will full power of substitution in the premises.

 

	Dated	 	 	 	 
	 	 	 	 	 
	 	 	 	 	 
		 	 	Notice:	The signature to this assignment
    must correspond with the name as written upon the face of the certificate in every particular, without alteration or enlargement
    or any change whatever.

 

	Signature(s) Guaranteed:	 
	 	 
	 	 
	THE
    SIGNATURE(S) SHOULD BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION (BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS
    AND CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM, PURSUANT TO S.E.C. RULE 17Ad-15).	 

 

The
holder(s) of this certificate shall be entitled to receive a pro-rata portion of the funds from the trust account with respect
to the common stock underlying this certificate only in the event that (i) the Company is forced to liquidate because it does
not consummate an initial business combination within the period of time set forth in the Company’s Amended and Restated
Certificate of Incorporation, as the same may be amended from time to time (the “Charter”) or (ii) if the holder seeks
to convert his shares upon consummation of, or sell his shares in a tender offer in connection with, an initial business combination
or in connection with certain amendments to the Charter. In no other circumstances shall the holder(s) have any right or interest
of any kind in or to the trust account.Exhibit
4.2

 

	NUMBER

                                                                                           

        MCAD
	 	SHARES

 

MOUNTAIN
CREST ACQUISITION CORP. II

INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE

COMMON STOCK

 

	 	 	SEE
        REVERSE FOR

        CERTAIN
DEFINITIONS

	 	 	 
	This Certifies that	 	CUSIP 62402D
    105
	is the owner of	 	 

 

FULLY
PAID AND NON-ASSESSABLE SHARES OF THE PAR VALUE OF $0.0001 EACH

OF THE COMMON STOCK OF

 

MOUNTAIN
CREST ACQUISITION CORP. II

 

transferable
on the books of Mountain Crest Acquisition Corp. II, a Delaware corporation (the “Corporation”) in person or by duly
authorized attorney upon surrender of this certificate properly endorsed. The Corporation will be forced to liquidate if it is
unable to complete an initial business combination within the period of time as set forth in the Corporation’s Amended and
Restated Certificate of Incorporation, as the same may be amended from time to time, all as more fully described in the Corporation’s
final prospectus dated                     ,
2021

 

This
certificate is not valid unless countersigned by the Transfer Agent and registered by the Registrar.

 

Witness
the facsimile seal of the Corporation and the facsimile signatures of its duly authorized officers.

 

	Dated:	 	 
	 	 	 
	CHAIRMAN	[INSERT SEAL HERE]	CHIEF EXECUTIVE OFFICER

 

The
following abbreviations, when used in the inscription on the face of this certificate, shall be construed as though they were
written out in full according to applicable laws or regulations:

 

	TEN COM	—	as tenants in common	 	UNIF GIFT MIN ACT	—	 	Custodian	 
	 	 	 	 	 	 	(Cust)	 	(Minor)
	TEN ENT	—	as tenants by the entireties	 	 	 		 	
	 	 	 	 	 	 	 	 	 
	JT TEN	—	as joint tenants with right of survivorship
    and not as tenants in common	 	 	under
    Uniform Gifts to Minors Act
	 	 	 	 	(State)

  

Additional
abbreviations may also be used though not in the above list.

 

     

     

    

 

Mountain
Crest Acquisition Corp. II

 

The
Corporation will furnish without charge to each stockholder who so requests the powers, designations, preferences and relative,
participating, optional or other special rights of each class of stock or series thereof of the Corporation and the qualifications,
limitations, or restrictions of such preferences and/or rights. This certificate and the shares represented thereby are
issued and shall be held subject to all the provisions of the Corporation’s Amended and Restated Certificate of Incorporation
and all amendments thereto and resolutions of the Board of Directors providing for the issue of shares of Common Stock (copies
of which may be obtained from the secretary of the Corporation), to all of which the holder of this certificate by acceptance
hereof assents.

 

For
value received, ___________________________ hereby
sell, assign and transfer unto

 

 

	PLEASE
    INSERT SOCIAL SECURITY OR OTHER

    IDENTIFYING NUMBER OF ASSIGNEE	 
	 	 
	 	 

 

 

	(PLEASE
    PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE)
	 
	 
	 
	 

shares
of the capital stock represented by the within Certificate, and do hereby irrevocably constitute and appoint 

 

____________________________________________________________________________ Attorney
to transfer the said stock on the books of the within named Corporation will full power of substitution in the premises.

 

	Dated	 	 	 	 
	 	 	 	 	 
	 	 	 	 	 
		 	 	Notice:	The
                                         signature to this assignment must correspond with the name as written upon the face of
                                         the certificate in every particular, without alteration or enlargement or any change
                                         whatever.

 

Signature(s)
Guaranteed:

 

	 	 
	THE SIGNATURE(S) SHOULD BE GUARANTEED BY AN
    ELIGIBLE GUARANTOR INSTITUTION (BANKS, STOCKBROKERS, SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH MEMBERSHIP IN AN
    APPROVED SIGNATURE GUARANTEE MEDALLION PROGRAM, PURSUANT TO S.E.C. RULE 17Ad-15).	 

 

The
holder(s) of this certificate shall be entitled to receive a pro-rata portion of the funds from the trust account only in the
event that (i) the Corporation is forced to liquidate because it does not consummate an initial business combination within the
period of time set forth in the Corporation’s Amended and Restated Certificate of Incorporation, as the same may be amended
from time to time (the “Charter”) or (ii) if the holder seeks to convert his shares upon consummation of, or sell
his shares in a tender offer in connection with, an initial business combination or in connection with certain amendments to the
Charter. In no other circumstances shall the holder(s) have any right or interest of any kind in or to the trust account.

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