I have been gathering a few of these over the years, and have started wondering if anyone knows the differences between the Camillus 1760/Mil-k 818 knives to know what change is indicated by the letters A-D. The final change from C to D was the deletion of the pin on the screw driver/cap lifter, but what is the difference between the Mil-k 818C and the Mil-K 818B? For that matter, does anyone know what makes the Mil-k818B different from the Mil-k 818A? I have guessed that the Mil-k 818A was all stainless with both handle sides the same (like on the Kingstons and Stevensons), while the Mil-k 818B has the cut out for the awl. Can anyone shed some light for me? Thanks!