I got mine in 1950 and it was used.
J.C. Higgins company
50-100 USD
Hi Standard 1950-3
50 to 150 depending on condition http://www.histandard.info/PDF/Sears%20Rifles.pdf {| |}
Most of these will bring $80 to $125 depending on condition.
Hi Standard model 499m
1955-1960 or so. Worth up to $125. http://www.histandard.info/PDF/Sears%20Rifles.pdf
The SKB M-7900 is a pump shotgun not a semi-auto.
Depends on the model number. Many different companies made rifles for Western Auto marking them with Western Auto's private brand. This also applied to Sears (J C Higgins) and Montgomery Ward (Westernfield)
Which make & model??
More than one JC Higgins 12 g semi. and more than one set of instructions. You did not give us a model number.
I don't believe there ia a model 19, a semi-auto? Possibly a 16? Is it a semi-auto 6 shot?