NONE of those basic 311 variants or other Savage/Stevens (Sears, Montgomery Ward,....) are worth > $400. I would not pay more than $350 for any gauge even if the thing had: original box, papers and packing materials.
When I can pick up Manufrance #208 (a better gun in every way) in VG shape for about $600 why would I want one of Savage/Stevens tools. I'm not that.......