That's the flabby drummer arm version. We're looking for the strong, muscular arm version which is very rare.
I'd say your coin is MS. Check the value. http://cointrackers.com/coins/875/1975-p-washington-quarter/
I just keep missing things here. There were NO quarters minted w/ a 1975 date. The quarters minted in 1975 carry the "1776-1976" date combination.
You are totally correct buddy.. We were just joking. The 1975 Quarter I posted is a fantasy issued piece. Not real. Google 1975 Quarter fantasy piece and you will see it for yourself.