This lock showes two matchlock/tinder lock mechanism on one lockplate. The left one is a standard trigger bar activated lock, the right one a snap tinder lock with a primive tumbler (red) with a spring for the counter clockwise action of the tinder holder. The tumbler is held in place with the dual acting sear. How this would work puzzles me a bit, the picture is of too low quality to decern the mechanics around the tumbler and sear. My guess it rest against the sear (yellow) as a square surface?
This lock does give some insight in how the missing lock on my gun could have looked like. The idea of a tumbler seems for now the best option.
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