Numbers stamped on the curved portion of the barrel flange, to include serial numbers on early Lugers (1900-1906), typically will not develop a halo. Numbers that are stamped after blueing further out on the straight portion of the barrel usually develop the halo effect. Perhaps something different about the structure of the metal created by the machining, or subject to different wear, or ??? I don't know why.
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If it's made after 1918...it's a reproduction
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