Diverg,
All Buck 110s have a stamp on the blade tang. The earliest 110s had a stamp of just "BUCK"; then in 1967 the stamp changed to read "BUCK" with "USA" below that. In about 1972 the stamp changed to read "BUCK" with "110" below and "USA" below the "110". In about 1975 or early 1976, there was a change to "*110*". The dots before and after the "110" indicate that there was a change in the shape of the tang and lockbar. Later the stamp changed to "*110**" which indicates a change in the rocker material, and finally the stamp became "**110**" to indicate a change in the blade steel. In 1986, yearly date codes started and the "dot" indications weren't used any more. In summary, the "dots" were used to indicate design changes that aren't readily apparent just by looking at the knife. Also, the "dot" symbols help figure out the approximate age of the knife for knives made before 1986.