If its in good condition: $50-$75
$399.00 on gunbroker
The value of a Springfield 20 gauge pump shotgun would actually depend on a number of factors. Some of these factors would be the age and the condition of the shotgun.
The Springfield 20 gauge model 94-B is valued at between $75 and $100. It has a 32 inch barrel, and a 2 3/4 inch chamber.
The value of a Springfield Model 947 B Proof Tested 12 gauge would actually be dependent upon a number of things. The main thing that would be considered would be the condition.
I would say 100 bucks
Gunbroker.com will have similar models in similar condition to which you can compare your firearm.
value of Stevens 20 guage model 94 F