The 1950-S RPM listed on PCGS CoinFacts and NGC VarietyPlus is a lot stronger and is repunched to the north.
http://www.varietyvista.com/09b%20W...0SRPM001.htm
This one also does not match any of the minor RPMs listed on VarietyVista or Wexler's doubleddie.com
http://www.varietyvista.com/09b%20W...201950-S.htm
http://www.doubleddie.com/1237724.html
MD is extremely common on the mintmarks of many of the silver Washington quarters, that's what I believe your coin has.
http://www.varietyvista.com/09b%20W...0SRPM001.htm
This one also does not match any of the minor RPMs listed on VarietyVista or Wexler's doubleddie.com
http://www.varietyvista.com/09b%20W...201950-S.htm
http://www.doubleddie.com/1237724.html
MD is extremely common on the mintmarks of many of the silver Washington quarters, that's what I believe your coin has.




















