Prior to 1965, the tang stamp showed "CASE XX"
In 1965, "U.S.A." was added below the "CASE XX"
In 1970, ten (10) dots were added below "U.S.A."
Every year thereafter, a dot was dropped. So five dots would indicate 1975. One dot would indicate 1979.
At the beginning of every decade thereafter, there was a different "code" of ten dots or ten stars or ten stars & dots, to assist customers and collectors, alike.
Like "Pre-64" Model 70 Winchesters, collectors look for "Pre-70" Case knives.
_________________________
Buck Buchanan, RKCC #CM-16, RKS #1003
NRA LIFE
NMLRA LIFE
Authorized Randall Dealer
buck100_10x@icloud.com