I have been collecting the W530 set for about 20 years. I have a low grade complete set, (minus Wagner), with all the known team changes.
I have never seen a W530 postcard back. If they exist, they must be very scarce. Scorecard backs are pretty scarce too. I would say maybe 20% of the population are scorecards.
I have never seen any information on who issued the set, whether it was the Pinkerton Tobacco company or some other issuer.
The cards that Leon has shown in this thread are part of a subset of Pinkerton images that are on real photo postcard stock. There is a thread about them under Pinkerton mystery subset, if I recall correctly.
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