I received one yesterday that I purchased from daggit (Thank you

), for my crown collection. When defining the set I would collect for myself, I made it a point to leave out any Proof or PL pieces. This one however, puzzles me. It sure looks as though it is a PL piece, but when I checked my Krause (not infallible I know) there is no PL listed for that year- 1965. Is this just a KM oversight or were all pieces made like this and just listed as starting from the MS scale?