A historical letter from Colt would be your best bet. They cost, but, are worth it.
Condition? Age? History? Size? Where? The questions go on and on.
provenance
If you go to this site and follow through ,they, perhaps, can answer you questions. http://www.coltsmfg.com/archive.aspx
studymode.com
No published history known.
My granda have one. She told me that she is going to give me her antique ring before she dies. She even told me the history of that ring and it happened 1915.
Mark Stamps has written: '.380 Enfield no. 2 revolver' -- subject(s): Enfield revolver, History, Revolvers
Track down the previous owners.
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Is there any other writing on this gun? I don't know what company would have marked marked a revolver with these initials.
You can get a historical letter from S&W for 50 USD.
No published history