Posted By:
Andy BaranJay,
Standard Biscuits and Moorehouse can be either set, but my experience is that the vast majority of cards with these backs are from the M101-4 set (my experience only). I've never seen a Gimbels that was from the M101-5 set, and I honestly don't know much about Successful Farming set, nor do I know if a Ruth has ever been seen with this back.
I will revise my statement that the best chance of a Sporting News #151 Ruth to be from the M101-5 set is with a Famous & Barr back. All other backs are either less likely to be from the M101-5 set, or in many cases, impossible to be from the M101-5 set (like the Sporting News Back in Lipsett's Auction.