The JC Higgins Model 45 was made by Marlin and is basically the same gun as the Model 336. Manuals are availabe from Marlin Firearms. The JC Higgins Model 66 was made by High Standard and is out of production. I have a manual scanned, and can email it to you. sales@countrygunsmith.net
http://www.histandard.info/manuals/sears/bashotguns/index.html
Under $150.
what is a J C Higgins Model 583.9 20 gauge worth
The JC Higgins 12 Gauge Bolt Action Model 5834 was produced from 1948 to 1968. It was sold by Sears under the JC Higgins brand and was known for its reliability and simplicity. This model is a notable example of mid-20th century American firearms design.
go to http://www.histandard.info/manuals/sears/pashotguns/0434di50r.pdf
http://www.histandard.info/manuals/sears/pashotguns/index.html
50-160 USD
Up to $125.
$75
looking for parts
The manual can be downloaded here: http://www.histandard.info/manuals/sears/index.html
It will not be easy to find a manual for a JCS Higgins 20 gauge bolt action model 583.15 shotgun. The company, JC Higgins is no longer around and has been replaced by the company, Ted Williams. The company, Ted Williams may be able to help someone find a similar model manual.