It depends on the condition, but if it's in pristine uncirculated condition, possibly up to $10. The mint did not begin using the P mintmark on coins until 1979.
quarter so then it is common not to have the D or P? no it is circulated.. I don't know much about coins, but after I found one of the down leaf wisconsin quarters I check my change NOW lol
Welcome to the forum bigred. Stick around a while, and maybe we will have a chance to also welcome you to the Hobby of Kings! Circulated 1968 Philadelphia quarters are worth four for a dollar. There were almost 221-million of them minted, all without a mint mark. The first quarters bearing a P mint mark were the 518-million plus produced in 1980. Washington quarters minted at Denver have carried the D mark since inception of the design in 1932.
Thank you I just got more quarters and noticed the same thing, and I know I am not that lucky thank you. -Jeff-