Partnership firm registration certificate

your firm is registered under Partnership Act. So you would have got the certificate of registration of firm from MCA under partnership act at that time after registration of that firm.

Thank you Mr. Arif ali for your reply.

Please help me to know how to get this partnership firm registration certificate now, as it was not received at the time of registration.

You have to get the firm registered with the Registrar of Firms of your State.  For Maharashtra you may visit the following link:

https://rof.maharashtra.gov.in/Business/Procedure%20of%20Partnership%20Firms,%20English.pdf