Picked this one up at a flea market in Millville NJ, bloke selling baseball cards, so not a bloke selling records in general $0.50.
had a good look round the deadwax, there is a stampmark on this copy, both sides, both identical distance from the matrix No,
had under bright lights, magnified, can not make out at all any lettering but it's defo a stamp.
Please check your copies and see if anyone can make any letters out.
Thanking you in anticipation
distances of stamp details.