I recently aquired a diving knife. It is marked FARALLON on the blade wit Japan on the reverse. It looks similar to a blackjack knife. It has a 4" blade with a rubber handle that is removeable. It has serrations on the top flat ground on the back side of the blade with a angle ground on the front.It takes and holds an excellent edge and I have been around and collecting knives for years and this one is a mystery. If anyone has any info about this knife please let me know. :dazzler1: