1944 silver Washington quarter with no mint mark on the front or back The coin is in fair condition so there is no sign of normal or forced ware to remove the mark Anyone have an idea?

Not all US Coins have a "P" Mintmark. The 1944 Washington quarter with no mintmark was struck at the Philadelphia Mint. No US coin before 1979 struck at Philadelphi has a P mintmark except for the War Nickels of 1942-1945