In searching for information on a recently acquired Casey Stengel disc by Associated Business Aids of Dayton, OH, I confirmed what I thought was a distant memory from 1973. The cover of the April 1973 issue of
The Trader Speaks (TTS) pictured three different discs: Stengel, Jesse Haines and Joe Medwick. I no longer have a copy of that issue (but recent eBay sales history shows one -
http://www.ebay.com/itm/April-1973-T...p2047675.l2557 ).
There are at least three different ones and, if memory does not fail me now, I believe the story behind them has something to do with these being sent out by the individual Hall of Famers pictured (or possibly the HOF itself) to persons requesting postcards. I think these were temporary substitutes provided until the actual plaque postcards became available.
One further comment: the Stengel card reads exactly as his HOF plaque postcard except for two things: (1) The card misspells Boston as Boxton and (2) the card carries two lines ("Current Vice President New York Mets Ball Club") which, of course, does not appear on the plaque postcard.