Just to add to what Larry said, the 8OT was the first of the Old Timer line, introduced in the late 50's with sawcut genuine bone handles. By 1963, all Schrades had been changed over to synthetic bone handles, the jigged was called "staglon" back then, now that term is used for the imitation stag as on the Uncle Henry line.
My 1963 Schrade catalog lists the 8OT, the 34OT, 18OT, and the 25OT, it calls the handles "Meerschaum unbreakable plastic". It also show the 58OT which was part of the Ulster line.
Larry, does that book only list Old Timers and Uncle Henrys, or does it cover other Schrades as well?
Steve