Hi, I saw the pair on Steve's site, a fine looking pair!! I think you'll find that you won't have any trouble with them. I've delt with Steve and he is an honest and upright guy. I'd feel good about any purchase from him.
The 12C in the "box" (diamond) just means that the gun is chambered for 12 gauge (or Bore when speaking about English guns). the 13 over the 1 means that the gun is bored tighter that the normal boring for a 12 bore gun (.729). This marking means the gun at the time of proof was bored to .719.
Again, congratulations on a fine pair of English guns!! Shoot them long and well.
All the best!
Greg
