A. Section 13 of special marriage is given below:
Section 13 in The Special Marriage Act, 1954
13. Certificate of marriage.—
(1) When the marriage has been solemnized, the Marriage Officer shall enter a certificate thereof in the form specified in the Fourth Schedule in a book to be kept by him for that purpose and to be called the Marriage Certificate Book and such certificate shall be signed by the parties to the marriage and the three witnesses.
(2) On a certificate being entered in the Marriage Certificate Book by the Marriage Officer, the Certificate shall be deemed to be conclusive evidence of the fact that a marriage under this Act has been solemnized and that all formalities respecting the signatures of witnesses have been complied with.
So, the said marriage certificate of yours is with the book and what has been given to you is a certified copy thereof.
B. No signature of yours have featured in the certificate you have received because it is the certified copy of the marriage certificate which has been kept by the marriage registrar in his book wherein both of you had signed.
C.The said document issued to you is the copy of your marriage certificate certified by the marriage registrar original of which has been kept by him in the book of the marriage certificates.
D. This is a perfectly valid document which can be used by you to establish that you are married to your wife.