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Andy BaranThe Famous & Barr back was issued for both M101-5 and M101-4. In my experience, most Famous & Barr backs are related to the M101-5 series, though I have seen an M101-4 Bancroft with a Famous & Barr back (based on the card #). To the best of my knowledge, there is no back that was issued exclusively to the M101-5 set, while many of the backs were issued exclusively to the M101-4 set.