Value of a used handgun?

I don't have the model # of the gun in question since it's not in my possession at the moment, but I may be acquiring a S&W 357 Magnum, snub-nose, in almost perfect condition, and was purchased new in the early 1980's. Black rubber grip, stainless steel, swing-out cylinder. Hasn't been fired in... show more I don't have the model # of the gun in question since it's not in my possession at the moment, but I may be acquiring a S&W 357 Magnum, snub-nose, in almost perfect condition, and was purchased new in the early 1980's. Black rubber grip, stainless steel, swing-out cylinder. Hasn't been fired in at least 16 years but was recently maintained.

I'd like to sell it or use as a trade-in for a different gun.
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