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fkwThe W501's will have a grainier photo, and some of the captions are different from the W575-1 cards. Some but not all W501's have the numbers on top border. Either these numbers were cut off or never existed. I have a Frisch (2B) that I know is a W501 (W575-1 say 3B), but the top border is nice and large without the numbers usually associatied with W501's.