As it belongs to that gent, and he's definitely not letting it go for a penny less, it's absolutely worth $535 to him. You can prove me 100% correct by offering him $534 and him saying "no thanks." Also hard to blame him for not wanting to separate the extra stocks and holster as those will often be even harder for him to sell without the revolver and most definitely be more hassle for him to sell as he'd have to move three items to at least 2, maybe 3 different people.
You're in luck... Smith & Wesson has made a zillion Model 60 revolvers, so keep looking. I wouldn't say his price is a steal, but it's not an "out of line" price for what he's offering.
You could always sell the extra stocks and holster to defray the 535 you had to come up with to get it. If you do that, you kind of "split the difference" with the seller because your "cost" drops but you get the hassle of moving the holster & stocks.
