Check out the thread below for info on 70's era 110 knives.
Read POST 4 from Chicken as it provides various data of intro and a link to the Buck site page that has "vintage" data and markings.
http://www.bladeforums.com/forums/showthread.php?t=456884
Also, check out the pics of a great assortment of 110 knives through the years from the collection of Mike Kerins:
http://s29.photobucket.com/albums/c277/michaelkerins/Early Bucks/?
All of the below (except the signature section) is 70's thru the 1980 year data I got from a cheat sheet put together by Joe Houser of Buck Knives, Inc.
I stole his homework after he gave me a wedgie:
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.
Sixth Version, (2 variations) Blade material 440C
Variation 1. (1974) Left hand stamped BUCK, *110*, U.S.A., stainless rocker rivet and spring holder, 2 brass inlay rivets, no blade bushing. “Non gravity design”.
Variation 2. Same as variation 1 above except 1 front and 2 rear inlay rivets, blade bushing added.
Seventh Version, (1 variation) Blade material 440C
Variation 1. (1980) Left hand stamped BUCK, *110**, U.S.A., stainless rocker rivet and spring holder, one front and two rear inlay rivets. Rocker material changed.