I too am really impressed with these great photos of a lovely lock. I take my hat off to you, Markus. I have a couple of the ordinary single stump version, but I’d love to get my hands on one of these. I imagine the purpose of the three stumps was to:
1) make it more difficult to drill the stump out
2) reduce the effect of end pressure on the bolt, am I right?
I have some questions about the levers: why do levers 1 and 5 operate only on the back two stumps? and why do only levers 4, 7 and 9 have all three gates cut at the normal width? I can see that lever 3 has extra wide gates, perhaps this was to accommodate 2 keys in a master-key system (?), but why do neither of the back stumps operate on lever 2, and only one of them on levers 6 and 8? Was this just for ease of manufacture? Anybody got any answers?
Diadalad
