My two older Buck 110’s have now been cleaned up, and are sharp and in pretty good condition. One that was acquired in 1989 has 1988 markings, black sheath; the other which was acquired in 1998 has 1994 markings, a brown sheath and finger-grooves. Both are 420HC, neither has the Paul Bos logo, but he was with Buck long before either knife was made so I’ll just assume... .