A big thank you for that extraordinary series of photos. Some like the Edward Lang and the Smith trigger plate lock are eye openers.
trw999- while designing a SXS I used CAD and made articulated drawings to check on angular fit and possible conflicting arcs in moving parts. A video can be made of these movements but so far I have not seen one.
As a simplicity nut I was fascinated by the Edward Lang use of the same spring to power the tumbler and the sear. It has an uncanny resemblance to the L.C. Smith lock. It must be the only sidelock with as few parts as an Anson-Deeley.
The true champion for me though is the Smith trigger plate lock. So simple, so elegant and so obviouisly exploitable as proven by the many "detachables" over the years. And yet so underexploited when you think what it could do. Gough Thomas was right about the mental inertia of gunmakers.
If anything was missing it is locks based on William Baker patents. Baker was a simplification genius and favored coil springs, as do I after some mishaps with V springs.
