It appears the bottom 2 locks, in the original post, are a "set" for a double barreled matchlock... a left and a right side.
It’s the same one lock, but the serpentine that isn’t positioned at the same 'degree of rotation' (in Pics 2 & 3) that gives the impression it comes out of perhaps a LH lockplate. Also note that the small whitish piece of ‘sand’ by the sear lever and coil is in the same relative place in Pics 2 & 3.
Note in Pic1 that the small leg of the serpentine is positioned OVER the sear nose, where it should be ‘trapped’ below it. If the spring was wound as such to provide a clockwise tuning motion, that serpentine should STILL be trying to turn to the right, right? As such, the only thing that would stop it, would be for that small ‘S’ leg to be
below the sear nose, i.e., held from moving.
Also note that the bigger, apparently non-movable wide lug at the bottom of the lock plate appears to function to block full 360 rotation of the serpentine. Thus, if there is not enough torque or energy now in the spring (doesn’t appear to be wound well, else the serpentine shouldn’t stay in position as in Pic 1) then perhaps someone had disassembled it & put it back together incorrectly?
That’s my bet anyways, as perhaps that bottom ‘anti-rotation’ lug - if not movable - is peened into place and the assembler didn’t wind up enough turns to the spring before hanging the serpentine (with that anti-rotation lug in the way). Best I can guess via cyber-space anyways!
