All Lugers destined for commercial export to the United States (including military guns sold to the US market as surplus) were required to have GERMANY or MADE IN GERMANY stamped on them in accordance with U.S. Customs law. Any Luger in the US not so stamped did not arrive in conformance with that law.
Your seller's claim is a bit of an overstatement. Although vet bringbacks were certainly not stamped, there might be any number of other reasons--one hears the most interesting stories--that a Luger might not be so stamped.
--Dwight
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