Phil,
A 1920 property mark is usually hand stamped and can be rather crude compared to a date stamp which is roll stamped. Most of the time, when a 1920 property mark was added to a military dated Luger , the original date of manufacture was left on the receiver, creating a "so called" double date. When military lugers were refurbished after WWI for the commercial market, property marks, dates and military proofs were removed.
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Mike C.
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