Sam: I also have a Model 12 Skeet in 16-ga. choked WS-2 (built in 1936). I'll try to get it and someone with the right tools in the same place at the same time to measure the bore, and will then share the results. I just committed to purchase its big brother, a 1937 Skeet in 12-ga. choked WS-1, which is why I was asking the question about the difference in the two chokes. Thanks to all for the explanation. TT

"The very acme of duck shooting is a big 10, taking ducks in pass shooting only." - Charles Askins