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You could likely list it for $150 and get that price. It appears to be in nice shape and if it's fully functional, there is no reason why you shouldn't ask that much.
A nice 402 in 12, 20, or .410 will bring $150. They are easy to use, especially the .410's. Like any single shot, the 12 and 20 will kick. Good little guns.
The plastic on the forarm often breaks & is very hard to find. In 12 125 is tops around here. I had some parts but I think there gone. Had one in 410, very nice to use.
http://clearlycanehdian.wordpress.com/2010/10/15/the-fish-and-game-sportsman-magazine-spring-1971/. For more info on the shotgun. I found an old timer who was retiring from farming sell one for $50 in good condition. On the Internet they are advertised from between $175 and $250 but I don't think they will sell for that price. I agree with everyone else that $150 is a good asking price to start at. Expect someone to talk you down to $120 to $130.