History of South America

What is the value of a 1776-1976 us quarter with no S or D marking?

Quarters minted in Philadelphia from 1796-1976 do not feature a mint mark. For these quarters, the absence of a mint mark indicates they were minted in Philadelphia. Thus, any 1776-1976 US quarters without an S or D mint marking are worth the same as any other quarter from that era minted in Philadelphia. The value of these quarters depends on their condition and whether they are circulated or uncirculated.