The tool was made in East Germany in the 1950th by the Ernst Tählmann Werke (Ernst Tählmann factory).
The muzzle protector was also used with the conversion unit by the police in caliber 4mm central fire. The number on it may be the number of the Luger (either the Luger serial number or the Police number on the frame) with which the conversion unit was used. My English is not good enough to say all but some members will do.
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