There is a card for sale on eBay that the seller is stating that, " don't be confused this is not a W575-1 but a second print of a W501???
http://www.ebay.com/itm/1922-W501-2-...wAAOSwX~dWtQcb
I never heard of a W501-2 and can't find any info on this type of card ? Being a type collector I find this interesting.