I have a Colt 1917 with three sets of serial numbers.
The Colt SN is on the frame inside the crane, on the crane itself and inside the side plate.
The U.S. Army No. is on the bottom the grip frame.
There is also a third, four digit number under the barrel by the "UNITED STATES PROPERTY", on the frame and crane adjacent to the Colt serial number AND, on the cylinder UNDER the extractor.

I have found a reference to an overhaul or refurb number that may have been applied during service or repair and the images showed a number with an identical number "1" to mine.

Does anyone have any information regarding this third number?
Also this revolver has an Ordnance stamp on the upper right side of the frame. Was this common and does it have any particular significance?

GS38

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