In my opinion, the device does not appear to be a silencer, but some sort of simple muzzle/flash suppressor which would serve no purpose or benefit using a 7.65 mm cartridge. In fact, I would expect the device to cause jamming considering that a Luger Carbine requires a powerful (DWM 471A) cartridge to operate the accelerator spring assembly. It is difficult to determine the period of this device.
Albert
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