In the condition you describe, and I hate to share this because I'm looking for one..someday, $500-$600. A piece of history, as it was the first production US made 9mm semi-auto. Many people still carry one daily, despite the zillion other models that followed it.
I suspect you're about to get a great deal. If you don't want it, please pass it on.
I know someone at the gun show that was offering to buy it said if he was collecting he would pay more as a collectors item $600 but for him it would be a resale item and he could not give what it was worth. I was not trying to sell it at that anyway. I was just wondering. He did say a collector would pay much more...
It has a very nice feel to it....and I wanted to shoot it but never have. i do keep it loaded...LOL just in case...I had to...very tempting....but I think it may have been shot at least once...by somebody but sure does not look like it...not sure if a cleaning kit ever came with it...it is not in the box but the box is dated 1978.
It's pretty widely held, at least among S & W enthusiasts, that the Model 39 fits the hand better than any other pistol. If you shoot it you will probably remove $150 in value, but who cares. You don't plan on selling it, hopefully you've made other provisions for the benefit of your eventual heirs, and the gun was made to be used.
Shoot the living heck out of it. Enjoy it, life's too short.
I would love a photo or two. Let us know how it goes.