IMHO $455 with nickel, one mag, no box, and Pachmayr grips is a decent price, albeit not a "Run Back There And Buy It
NOW" price.
OTOH if you can talk them down...
There's one caveat: fairly common S&W's like the M39-2 seem to take a proportionally bigger value hit for blemished nickel than for slightly worn bluing. At this price, a handful of pock marks or scratches are OK, but
any flaking, peeling, or deep pitting should knock the value down substantially.