Take a pencil, try to drop t down the front of the barrel. If it won't go / is tight, its 30 luger (7.65mm) and if it falls down the barrel its 9mm (unless its been modifies, which is always possible, but not usual).
"Normally" you see the last 2 of the serial number, in this case the serial number IS 2 numbers so, its okay.
Very odd barrel, since it is "set back", and as someone says, it DOES look like a proof barrel.....
Ed
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