Lloyd,
What Bob said. One of the sleepers from back in the day are the pre Garcia Beretta Silver Snipe O/Us, but, it has been a long time since I have seen a 20 go for less than about $800. You get Italian quality, a reliable, but, non selective single trigger, and fixed chokes. Steel shot is at your own risk. At this kind of money, I wouldnt lose much sleep over it, assuming less than modified choke.

https://www.gunbroker.com/item/885237588

Best,
Ted