I am sure there are units for which there are few surviving examples of Lugers marked to that unit, but whether that makes them more rare or valuable is hard to say. As Don indicated it pretty much depends on the desires of the owner/buyer. For instance, I have a Garde Grenadier marked First Issue Luger that I have never seen another, but I am not sure that makes it particularly rare or valuable.
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If it's made after 1918...it's a reproduction
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