Not sure how you came to that conclusion from the information given and the sheath shown in the link you gave in #30 is not the same as your sheath. Your sheath predates that one and is constructed entirely differently. Your sheath was replaced by the style shown in the link about 1980/81. Yes, the knife is the same as yours but the sheath provides additional clues as to approximate age. Yours would be older. This all assumes the sheaths are original.
Your sheath is called a "swivel" sheath because the belt loop swivels on the rivit. The construction is folded leather on the R with a sewn seam on the L. This was the typical style used thru most of the 70's for the 119, 120, and 124.
The sheath shown in the link is of flat (not folded) construction and sewn around the entire perimeter. This style starts about 1980 or 81.