I won't disagree with any who describe it as a defarbed and/or well used Italian reproduction. However, the flask spout in that case is of a type nobody makes anymore. There were roughly similar spouts on the Hawksley flasks which are now very hard to find in this country, and I have not seen that type of spout on any Colt or Remington reproduction flask. The point being that the flask looks old, to me. Likewise the cap tin. There is only a limited view of the mould, but I see a nice patina that would be difficult to replicate. The case was either artfully aged or is a real antique.
In my opinion, which is not expert, $300 would be a good price. If you are buying it for resale, or as an investment, I think I would pass altogether. I don't think I've ever made money on a gun trade.
If you want a really cool antique-looking revolver as a cased set, I doubt you could replicate anything close to that for less than $700, and $500 would not be an unreasonable ceiling for your bid.
If you want a shooter, and the accessories are irrelevant, I think you would be better off buying a new repro and sending it to Goon's Gun Works for set-up and tuning.
I can't identify the revolver.
@sourdough could have told us, but he has gone to his reward, and may he rest in peace. Anyway, the brass frame, rebated cylinder, and octagonal barrel are an odd combination. I can't tell what the cylinder engraving depicts. Are there any markings at all on the barrel?
So, I guess what you bid on this outfit would depend on what you want, how badly you want it, and what you intend to do with it.
I will say that if you have a tight budget, impulse buys are rarely a good idea.
In any event, I want to wish you the best of luck with this gun! Thank you for presenting it to the rest of us, and we hope you'll let us know if you find anything to positively identify this enigmatic revolver and accessories.
Notchy Bob