1920 Advertising Cards
 

Anyone know a source where I can read up on these and their possible value? Issued by bars, barbershops, etc. Not sure if these are cataloged anywhere or not.

Be more specific. Approximately 99.999% of those pertaining to baseball with players on them, on ebay, are fakes. (seriously)

You may have anticipated and just answered my question . . . . .see a lot of Gehrig and Ruth ones on eBay going for $25. Same people selling them non-stop. Just didn't seem right . . . . .