Colt M1903 with strange sight

[hsr]

I just acquired this Colt M1903 revolver. Decent shape, nice bore, and good lockup. Serial number 200311. The numbers on the crane and barrel don't match.





There are 2 things which I did not notice until I got home and I am curious about. First is the inscription on the barrel;



with patent dates of 1900 and 1905. The marking on the side is Colt D.A. 38. I know it is a replacement barrel, but from what with the 1905 date?

Second is this strange rear sight;




It would seem to indicate someone was trying to improve accuracy and it is very well done. I looked through my copy of Best and didn't see it anywhere, it is probably not a Colt or and Army modification. Anyone ever see something like this?

Comments?

Thanks

Howard

Information

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[Bruce McAskill]

The replacement barrel may have been for the Army Special Model. Barrels up to 6" in .38 Colt and would have the 1905 patent date on it. I have no idea about the rear sight other then someone trying to get a better sight picture. Seems to be well done though.