Welcome to the Lugerforum Frank. This is commonly called a "double-date" but that name is wrong.
1917 was the year of manufacture. In 1920, the German government declared that all arms that were government property were to receive a stamp to indicate that it was not private property... the second date (1920) is the date of the marking used for that purpose.
(Boy that guy Alanint sure can type fast!)
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regards, -John S
"...We hold these truths to be self-evident that ALL men are created EQUAL and are endowed by their Creator with certain UNALIENABLE rights, and among these are life, LIBERTY, and the pursuit of happiness..."
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