CRT...
Hope this helps. If I read the below correctly, a 1970 would NOT have "110" stamped on it.
I copied Joe Houser's (Buck Employee of The Month) homework:
Third Version, (7 variations) Blade material 440C
Variation 1. Left hand stamped BUCK*, butt rivets, blade bushing, and spring holder integral to right hand side, blade rivet separate piece, spring inserted into spring holder. 2 brass inlay rivets, brass rocker rivet.
Variation 2. Same as variation 1 above except left hand stamped BUCK. (No dot)
Variation 3. (1967) Left hand stamped BUCK, U.S.A., butt rivets, blade bushing, and spring holder integral to right hand side, blade rivet separate piece, 2 brass inlay rivets, brass rocker rivet.
Variation 4. Same as variation 3 above except no inlay rivets.
Variation 5. Same as variation 4 above except one separate piece butt rivet, no blade bushing.
Variation 6. Same as variation 5 above except two separate piece butt rivets.
Variation 7. Same as variation 6 above except right hand stamped.
Fourth Version, (2 variations) Blade material 440C
Variation 1. Forged sides, (1970), Left hand stamped BUCK, U.S.A., brass spring holder separate piece, two separate piece butt rivets, 2 brass inlay rivets, brass rocker rivet.
Variation 2. Same as variation 1 above except stainless rocker rivet.
Fifth Version, (2 variations) Blade material 440C
Variation 1. Left hand stamped BUCK, U.S.A., stainless spring holder, two separate piece butt rivets, 2 brass inlay rivets, brass rocker rivet.
Variation 2. (1972) Left hand stamped BUCK, 110, U.S.A., Stainless rocker rivet.