Michael, all I know for certain is that chamber was in an original and untouched Sharps M74 marked .45 2 1/10 on the barrel. I'm quite certain of that. It was not a conversion rifle either. It does corroborate well with other original Sharps target rifles that others have reported. For a few years, I was all over looking for castings of original chambers and this was pretty representative of them.

I am unaware of an original Sharps marked .45-70 as opposed to 2 1/10.

But I'm unaware of lots of things.

_________
BrentD, (Professor - just for Stan)
=>/

[Linked Image from i.imgur.com]