Marriage License Documentation NYC311 - NYC.gov
You have the option to order a duplicate of a marriage license by sending a request through the mail or visiting in person. The cost for obtaining a marriage license certificate within the country (short version) is $15, with an additional $10 for each extra copy...

The New York City Matrimonial Index, 1950-2017 - hosted by ...
Public access to marriage index files is permitted without limitations on the year of the record.

New York State Matrimonial Documents Confusion: r/juresanguinis
Different regulations apply in NYS than in NYC, so ignore anything pertinent to NYC. - NYS birth documents are not available to anyone aside from the parent or the individual in question...