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Hmmmm. I knew that the Trapdoor was introduced in the 1870s, but I wasn't sure if the 45-70 round was used in another rifle prior to the trapdoor.

Really? That old. I'm glad I kept it instead of firing it. Is it worth much? I only have two rounds. Thanks for the info Skip.

I have some vintage 45-70 ammo with the following headstamp.

U.M.C.
S (primer) H
.45-70.

Any ideas about when this was manufactured?

TIA
Bruce Sharer