Heinz, I agree that all of the WW1 vintage LPO8 barrels that I've seen are Erfurt Imperial eagle proofed and have an assembly number that is stamped into the top of the rear sight dove tail (mostly covered by the rear sight when installed). This is not the same as the serial number of the pistol, which leads me to believe that all of these LPO8 barrels may have been subcontracted, and supplied to Erfurt and then DWM, as needed.
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