g8rb8, I admire your optimism, but its shouldn't be wasted on this revolver. The OP sated in the original post that the revolver and box have the same serial number , in the 204K range. That makes it roughly a 1981 or 1982 gun, that's why it doesn't have a barrel pin. Its clearly a refinished 18.
Scotly, S&W didn't make stainless or nickel sights, nor did they put stainless or nickel hammer and triggers in model 18s. I guess its possible that someone swapped the trigger and hammer from a stainless K Frame and found a rear sight from a 1970 model 66, but that's very unlikely.
The logical explanation is someone had this revolver hard chromed. In the early and mid 80s a lot of people were sending guns to a company called Robar and getting them hard chromed or NP3 finished.
You didn't say if the ejector star was blue. I'm guessing that its the same finish as the gun. Another indicator.
Its more accurate to say that since the gun has been refinished the value is , rather than IF.
It's still a very attractive, useful version of a very popular revolver. I'd value it at $400.00 to $500.00. Possibly slightly more to someone who really wanted an carry and shooter K22.