Everybody, inlcuding Igor Karklinsh and Dig Hadoke, say they're pretty commonplace - but I still find them amazing.
A combination of perhaps the most advanced action for the edge, and the oldest viable lockup - sounds as post-modernistic as anything you can find in a modern art gallery.
(this one is (c) Dogs and Doubles Do you agree that the rationalle for the design was an overreacted attempt to play it safe: Nitro cartridges were still a new thing in 1890s, and gunmakers weren't too sure what their actions and metal could handle.