Which model are you asking about?
Stevens made jc Higgins shotguns ,the model 311 interchanges with the jc Higgins
Up to $125.
$64.95
Early 1950's
JC Higgins Model 20 Shotgun does not have a serial number. Guns were not required to have a serial number before 1938
75 to 150 dollars
$6500 easy
$150.
NO
It had some bolt issues
$1,500
Impossible to answer- there were dozens of models.