Welcome! Technically, that would be called a Model 3 Russian, 1st Model even though it has the frame swell and larger trigger pin. The "Old Old" name is archaic and confusing at best, but the fact that a 2nd Model is called a 1st Model is also confusing. It seems that during the contract order for the 1st Model, a change was made to increase the size of the trigger pin and to add the notch to the hammer to lock the top latch in place when the hammer was at rest. Your revolver would have been part of the 20,000 contract guns made for Russia, most likely shipped in 1872. This Russian contract model is very rare in the US, with only few known.
The stocks of the gun are worn from sanding and are under-sized, not fitting the frame. The finish looks too fresh for original, since original finish guns from this era had a higher polish and yours looks flat. For some reason, re-blued guns often have a cylinder that turns plum color over time. I believe it is due to the metallurgy being different in the cylinders than the rest of the gun and not taking a blue as well. Adding nickel to steel, for example, toughens the metal but also makes it much more difficult to color.
Bottom line is that you have a gun that is has not been mistreated or damaged in use. It has very smooth metal and most likely just lost its bluing over time. Fortunately, the refinish did not include a buffing wheel since the stamping and the edges remain sharp, that coupled with the rarity means you still have a very nice and significant Smith & Wesson revolver.
I forgot to add this older Supica video showing a sharp no finish Model 3. Prices are old, so it might be worth more now.
[ame]https://www.youtube.com/watch?v=GCvyc__wLIQ[/ame]