Mark, just as in England, Germany requires unproofed guns that are to be sold on the civilian market to pass their proof houses. My 1927 Argentine Colt is also proofed in Germany, indicating that the Argentines sold the pistol to a German firm who, in turn, sold it to the US importer.
Your GI 1911A1 may have been captured during the war and proofed only when it was privately sold. Or it may have been part of a larger consignment of guns imported for civilian sale. There's really no way of telling that I'm aware of.
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