As mentioned the gun has been Nitro re-proofed with 2 3/4" chambers & for a 1 1/16 oz load. Bores are 16/1 which could mean they have been enlarged. It is also noted the Not for Ball is visible on both barrels from original proof, which should not be present on a cylinder bore.
Six-nine while not a true lightweight can be a very nice handling gun. I have a couple of 16's which go six twelve which handle nicely with 28" barrels. That cyl &* half combo is to me. a very desirable choke combo.
Lovely gun, Enjoy it to the fullest.
