Hi Cornelis,
Imagine: this kind of perfectly thought out interior lock design was actually in wide use in the big firearms centers all out thru Nuremberg, Augsburg, Munich, Suhl, and Regensburg (all Bavarian except Suhl, which of course is in Thuringia) since the 1550's!
(With slight differences in the earlier years, of course ...)
Best from Bavaria, and tipping my next dark beer to Holland and one of its masters of great private collections

,
Michael