Hi David,
It's too bad that we can't have clear photos to work with so you will have to be our eyes. Two questions:
1/ Is there a Naval inspection mark (C/M) beneath the barrel and positioned just above the serial number?
2/ Is there a Naval proof mark (Crown) on the left side of the barrel near the breech?
If the answer to both questions is "No", then the barrel failed inspection and was rejected before it was ever attached to a Navy Luger.
If the answer to question #1 is "Yes" and #2 is "No", then the barrel was attached to a Navy Luger which failed proof but the barrel was deemed acceptable for Commercial use.
If the answer to both questions is "Yes" then I give up!
Norm
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