Maybe this will help. In about 1965, Buck used a BUCK dot stamp on fixed blade knives and the 110. We are not sure what, if any, significance that dot held. These can be found with both horizontal and vertical orientation. However, the horizontal orientation is found only on model 121s and model 110s. By horizontal orientation, I mean to say that the BUCK dot stamp is parallel to the spine of the blade. Then, in about 1974, 110s and 112s were marked with two dots, one before and one after the model number on the tang stamp (.110.). This was to signify that the knife tang had been slightly adjusted to attempt to prevent it from being converted to a "gravity knife". Later, in about 1980, a third dot (.110..) was added to indicate the addition of a bushing to the pivot pin designed to make the knives (models 110 and 112) operate more smoothly. Finally, in 1981, four dots were used (..110..) to provide evidence that the steel was now 425 modified. Please note that all of the dots combined with model numbers concern both model 110s and model 112s.
