OP - so what is the caliber? If it is a .44 cal., it is a 1860 clone - if it is .36 cal. it is a 1861 Navy clone.
Is the cylinder roll engraving "turned" off or does it just appear to be "white" due to the reflection of light in the photo? I can't imagine why anyone would go to the trouble to rurn the roll engraving off . . but you never know I guess.
As far as a "shoulder stock" for it goes . . . it's highly unlikely that the seller will have one. In years past, shoulder stocks were usually sold and an "accessory" if a person wanted one. Some repros were sold with a shoulder stock but the majority were not. I remember that in the early '60s, I believe it was Replica Arms who had them available with shoulder stocks IIRC. Be aware that shoulder stocks were usually made to fit specific reproduction revolvers and not always interchangeable between different manufacturers, regardless of if it was the same model revolver.
Yes . . some ASM (Army San Marco) revolvers had the reputation of having "soft" internals . . . but don't let that scare you away - check it out and see if it looks good, indexes properly and has good lock-up. I have know fellows who have had ASM revolvers for years and never had an issue with them. I have owned several through the years and never had an issue with them when I owned and shot them. Yes CVA imported ASM revolvers and usually they will be marked with the CVA stamp. I bought a ASM CVA 1861 about ten or so years ago that was new in the bo made in the early 1980s IIRC. It was a beautiful revolver - excellent fit and finish - smooth action, etc. I picked it up at a reasonable price just to have as a "back tip" on the shelf - I have always favored '51 Navies. I have way too many C & B revolvers and I showed the '61 ASM CVA Navy to a fellow one day and he wanted it in the worst way, so I sold it to him. As far as I know he still is shooting it and had never had an issue with it. I also ran across a ASM '61 Richards and Mason conversion one time (38 spl.) and it was a beautiful handgun. I passed on it as I was buying two other cartridge revolvers from the dealer at the time and I have always regretted passing it up.
Check the revolver out and if it is a good one, then you can decide as the $200 price you mention is a fair price. If I ran across one like that - either a '60 Army or a '61 Navy, it would be going home with me.
Good luck!