If you look at the bottom of the barrel, I would guess that you will find markings indicating that the gun was tested to "XX tons/square inch" or words to that effect. In all probability your Luger visited Britan's shores and was proof tested and given a coat of a very durable black enamel over top the original finish. There is an "official" name for this enamel, but it escapes me for the moment. I will try to dig it up.
Found it! It is called "Suncorite".
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If it's made after 1918...it's a reproduction
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