I would say it is the weapon number
Perhaps at one point it had a unit marking, but maybe not, there was a small period of time where armorers were told to just put the unit number on the gun and this might be one of those interpretations, either during war or after the war.
ed
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Edward Tinker
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Co-Author of Police Lugers - Co-Author of Simson Lugers
Author of Veteran Bring Backs Vol I, Vol II, Vol III and Vol IV
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