Marked RNWMP (for Royal Northwest Mounted Police) by any chance?
The forerunner of the RCMP carried those in both .455 and .45 Colt calibers.
ETA: IT looks like a Colt New Service model.
A Colt collector will jump on me for saying this, but the 1917 was just a variation of the New Service to shoot .45 ACP.
I "think" you had to use the half moon clips with the Colt Model 1917 because they did not actually cut chamber edges (chamber mouths?) in the cylinder, and the rimless .45 auto round would slide right through (seem to remember reading that ???).
Is there any markings on the butt of the grip. My 1917 was U S Army and had the model on the grip butt where the lanyard swivel is.
I looked and it appears those markings were ground off a long time ago, major bummer.
An FYI: 38 WCF (Winchester Center Fire) is the 38-40 round.
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