Feinburg's Loan and Pawn was an antique store located on Columbus Avenue in San Francisco, Earth. The store had a policy of "no lay-away, no credit cards, on sale items".
In 1986, James T. Kirk sold a pair of antique eyeglasses to this store. (Star Trek IV: The Voyage Home)

The glasses, and their pawn ticket
Kirk used the alias Sydney Carton, a character from A Tale of Two Cities. He listed his phone number as 555-1701, an obvious reference to the USS Enterprise. The date is given as 19 August, the birthday of Star Trek creator Gene Roddenberry.
The name of the shop is apparently an in-joke reference to Star Trek: The Original Series property master Irving A. Feinberg.