Hi Greg,
Welcome to the forum. WW1 Lugers were manufactured in blocks of 10,000, starting with 1-9,999, then 1-9,999, letter suffix "A", then "B" etc. for each year of manufature
Does your serial number have a letter suffix? If not, it would have been made in the first number block of the year on the gun's chamber.
Is the "1920" on your chamber alone, or with what looks like another, earlier date? If ther are two "dates", then the "1920" is not a date but a Wiemar Goverment property code.
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