Yes! It's Mauser.
The first picture shows the problem. Either the rocker plunger or the disconnector does not work on this gun. As you can see, the hammer falls into the locking notch under the bolt while the bolt is open. This is impossible on a healthy gun with rocker plunger.
Earlier Mausers, Conehammer, Transitional Large Ring, and Italian Flatside do not have rocker plunger, so the hammer is not disconnected from trigger while the bolt is open. On this gun, the disconnector is supposed to be pushed away from the trigger by the plunger when the bolt is unlocked. Without trigger support, the disconnector under force of the "V" sear spring brings down the sear, so the hammer cannot be released at bolt open position on a healty gun.
To figure out what's going on -- take the lock frame out, and couples the bolt lock on top of the lock frame (like gun assembly). Using fingers to push down the bolt lock to emulate unlocking, and observe the behavior of the plunger and disconnector.
Then, put the lock frame into the grip frame without upper barrel assembly, coupling the bolt lock on the top, repeat the previous process, also add hammer cocking, trigger pulling operation into it, you will figure out what's wrong.
From other pictures, the disconnector and sear does not fit well. Also, if I remembered right, the sear of this period is also supposed to be numbered (? don't have my collection at hand, no way to check, I could remember wrong on sear numbering. Mauser changed back and forth on this). Please also note the sear spring's coupling with disconnector is marginal on this one, which is also very suspicious.
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