Proofhouse.com has a store brand chart. When you find out who made it a value can be estimated.
7lbs
EBay for 38.00
No published sn data.
Up to $100.
$175-$225.
$80-$100.
Try e-gunparts.com
No sn data available.
100-300 USD
Savage Arms and J Stevens made the J. C. Higgins sears robuck and company shotgun. If you look on on the right side of it should say Stevens model (whatever model # it has here) like mine says (Stevens model 311A)
10-90 usd