Hi Brice, and welcome to the forum.
It looks like you have a mixed DWM Luger with a Weimar era receiver and a frame that was in Weimar police service in Frankfurt. The "33" has nothing to do with Simson. It is related (if anything) to the weapon number in the police inventory. The dies do not look factory.
It is possible that it was a Simson rework of a DWM for the police, but the inspection marks are early Weimar "dove" markings.
Is there a "1921" date on the receiver chamber?
"7392a" is the gun's serial number, but the dies on the front of the frame do not look factory, and it may have been renumbered.
Take a look at our FAQ document... You'll find it interesting.
Rather than a coincidence, it's possible that the person finding a "33" marked toggle train installed it from a stock of parts to look "more matching"... The breech block has an imperial eagle proof mark.
Marc
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