I've always had my doubts about the lunchbox-special scenario. According to the 1910 marking instructions, any receiver which has a chamber date will also have at least the first receiver inspector stamp. The second stamp is applied at the same stage as serial-numbering the parts. A lunchbox-special, therefore, would not have any serial numbers (unless the employee contrived to steal an entire whole gun after stamping but prior to final assembly for power-proofing).
From memory, I don't think that armorer's kit parts were serial-numbered. My recollection is also that receivers were not armorer parts.
Sorry about the negatives, its still too much of a puzzle.
--Dwight
|