I get into more trouble with that signature line...but that is OK, I'm too old to change now.
I would really like to see a couple more detail shots of that toggle lock. It looks almost like a modification to unlatch the lock to make it easier to work the toggle to load the weapon. A lot of folks have difficulty in understanding that on an Old Model you have to pull the toggle knobs slightly to the rear and then up. The knurling at the top of the latch on this gun might indicate that by depressing the latch at the top it frees it from the catch on the frame, eliminating the need to first pull the knobs to the rear. An interesting possibility.
Ron