As requested, here are some pix of my Buck 119 and 120. Also is a picture of my Buck Frontiersmen.
The Buck 120 was purchased in 1976. It has the black phenolic grip. I carried it, in addtion to my Buck 110. One of the specialty knife stores in Louisville, KY (Heimerdinger's) sharpened the top edge of the 120. The 119 is more recent, and has only been carried a few times.
The Buck Frontiersmen were made about 28 years apart. The blades on both knifes are right at 6.5" +/- 1/8". The 1973 grip is a bit bulkier, and more edged. The width of the blades, at the widest varies by about 1/8".
Enjoy!