Remember the large model I posted pix of a while back (sorry could not find that discussion.)
Anyway, I may have mentioned that it had corroded enough that I couldn't read all the muzzle markings.
Amazingly another one has shown up, privately owned, and a friend sent me pictures. All the muzzle marks are legible or mostly so, on the other one, so now I know a lot more about that marks that were on mine way back when.
The black one is mine, and the rust-patinated one in the last picture is the other person's. The full set of marks should read something like
"Fort Pitt, PA No. 3 115,400 Lbs. TJR 1864"
On mine I could read the "TJ_" and part of "1864" and some other letters but it was tough and uncertain. Now I know! Must be livin' right as they say.
No one I've talked to knows exactly why these were made but the way things were done back then, we suspect these were poured form the same metal heat as the big guns, for presentation to bigshots or something like that. I'd love to find some official documentation on them some day.