I didn't know what other term to use for that type of lock because it is not actually a side plated box lock either.
O.M
Simplex was the term Tobin used.
My Tobins were the oldest guns I have ever used/owned. To be fair, they had all been used, some very hard, by the time they got to me. It was a pleasure to carry the 16, which, would have been around 100 years old, at the time. A lot of guys like putting that history back to work, in the fall. Nothing at all wrong with that. But, I get it that most guys arent interested in going down that rabbit hole. Most double guns are a rabbit hole, and the really old, and primitive designs, are a deeper rabbit hole.
Best,
Ted
