John Stimson
Member
There were a number of different variations of the Sears J. C. Higgins Model 10 which are distinguished from one another by teh Sears reference number 583.??. The 583 part of teh number was sears source code for High Standard. Tha balance of the number tells teh model and variation. After December 1956 there should be an assembly date code on teh barrel just forward of the receiver.