A quick look at the overall appearance reveals a non-original look to the finish. Lack of wear , odd uniformity of bluing , and so on. Then , look closely at the side plate seam. An original seam from that era should be tight - amazingly tight given the technology available at that time. The machinists working at Smith & Wesson , as well as other gun manufacturers 100+ years ago , were very highly skilled. The seam on your revolver displays an open appearance which would suggest that the edges were rounded in the course of buffing and polishing , part of the preparation process for re-bluing.

Referring to the images you posted - the portion of the side plate which holds the forward-most screw is an example of what I am describing.