How is the box marked, or is it marked at all? Based on your limited description, the knife could be either a C16 Goddard or a C18 Goddard Jr since both were available in black micarta with fully serrated G-2 blades. The determining factor would be size/blade length. C16 has a 3 5/8" blade and an 8 3/4" OAL. C18 has a 2 7/8" blade and a 6 7/8" OAL.