Win712, thanks for the tips.

I checked out Old Ammo web site, and wrote to Guy Hildebrand.

He thought many of my shells were pre 1880, as the "U" stamped cases started production in 1880, and the earlier, plain bottom cases would be earlier than 1880. Close to the 1865 birth date of the Model 1 1/2 I found. Some might even be Smith&Wesson rounds, but I'm trying to determine if I have the correct bullet type of the 5 versions I have.

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S&WCA #2018