I'm not sure when A and B brass shells first became available, but they are listed in the Union Metallic Cartridge Co. catalogs from 1880 through the 1885-6 catalog. Not mentioned from the 1887 UMC catalog and onward. As I recall I read somewhere that the Parker Bros. brass shells were made for them by UMC, but I don't have that reference in front of me.
I don't see any mention of A and B shells in the 1878 E. Remington & Sons catalog.
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