1962
1967
1958
1967
The JC Higgins Model 31 rifle was manufactured for Sears and Roebuck by Hi Standard.
The J.C. Higgins Model 33 was manufactured by the High Standard company.
The JC Higgins Model 80 was actually made by High Standard for Sears, and is the same as the M101 Duramatic pistol. Made from 1957 through 1961/62. These can be bought on the use marked for $200-$250.
Sometime in the 40s
High Standard http://www.histandard.info/PDF/Sears%20Rifles.pdf
50-126
Cross reference it to a manufacturer's model (proofhouse.com has a good list) then look up that model in the Blue Book or Standard Catalog of Firearms.
The serial number indicates your standard-type Model 37 was manufactured in 1953.
The serial number indicates your standard-type Model 37 was manufactured in 1953.