I have a two dot 112. The two dot knives, according to Buck's website, were made between 1974 and 1980. The handle should be macassar ebony and the blade is 440c steel.
Woops, I didn't see you already knew it was a 74-80.

According to the data sheet in the sticky, I think this is the 110 you may have. I don't know much about the finger grooves, though.
Variation7 (1974-1980)23
Stamp:BUCK, *110*, U.S.A., left hand. Read with tip point up, 440C steel.
Blade/Buttrivets: Visible onboth sides of bolsters, 2 rear, 1 front.
Inlayrivets: 3 (largeheaded)
Rockerrivet: Stainless,headed.
Sheath:Black leather. C.
Packaging:2 piece yellowbox about 2 high-(2), Use and Care leaflet dated 4/77-(1),10/76-(1), Attention leaflet orange-(2), white tissue-(1), AlBuck note-(1), 1 piece yellow box about 2 high-(3), Use andCare leaflet dated 12/78-(1), Al Buck note-(2).
If I had to guess, and I'm probably wrong, I'd say your 110 was made near the end of the 74-80 timespan.