When the gun is delivered I will do a check on bore size, chokes, weight, better photos of the proof marks and post the results. like Larry I have never seen one with the Iver-johnson marks and been looking at SxS guns for a long time. I bought it assuming the chambers are 2 1/2" which was standard in the US at the time, considering the apparent condition of the gun my guess is that it has not been messed with, but who knows.

I learn something every day, and a lot of times it's that what I learned the day before was wrong