English SxS, 2 3/4" chambers, reproofed recently enough to have .729 bores marked, but not proofed for BAR...

What else can we see here?

[Linked Image from i.postimg.cc]

...you should be able to click through and enlarge.

I'll be out the rest of the day so won't be able to answer any questions until late, but will do my best then.