Originally Posted by DWalt

Under normal circumstances I wouldn't pay $75 to get a letter. But if you don't mind the cost, it might be interesting to see what the letter says, as I show SNs either side of yours which are prefixed SV, not V. Are you certain yours does not have the 1945 improved drop safety? Looking at the sight again, an original blade could not be modified to that shape. Someone has made a different front sight. What exactly is the barrel length - looks like it might be a little shorter than the 4" it should be.

Harry Truman's personal sidearm was a M1917, in the Truman museum. I don't remember if it was a Colt or a S&W.
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It is stated to be a Colt.