1980 was the first year the mint started using the P mm on nickels, dimes, quarters and halves. All 1980 quarters minted in Philly have a P mm
10 Cents.. Worn Die Strike yes.. 25 cents. It was minted in Philadelphia. If you read the responses on the earlier posts of this thread you will get your answer.
This SEVEN year old thread is an excellent example of the longevity of some that join. I don't say members because some didn't last a whole day. LOL
Same question ---EBay drives me crazy when they advertise a Quarter without mint mark for 1200 dollars.A little research and you wouldn't be asking that question