Neat old S&W. I am 'way outside my expertise on these early firearms. Given the serial number and a short perusal of the S&W Catalog 4th edition, I would guess it is a Second Model American (Model No. Three 2nd Model Single Action.) You are correct that the barrel has been shortened but the sight is similar to the original which was also pinned in place.
If I am correct, and others will be along shortly with better information, the serial number range was from 8000 to 32800 with 20,735 manufactured circa 1872-1874.
Catalog says a key to identification of this model is a "bump on the bottom of the frame" which I don't see on your revolver. So all my speculation may be totally wrong.
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