Custom Hunter Book Date code 19581 indicates this

Date code 19581 indicates this knife was made in the 1st 1/2 of 1985

2 5/16" blade of CPM-154

Textured blue G10 scales

Heat colored mosaic Damascus steel frame with mother of pearl scales

Baltic Brown from Russia

Custom Hunter Book Date code 19581 indicates this4 1 4" blade of carbon steel, 8 3 4" overall length Thumb notched blade spine Ebony wood scales with unusual epoxy covered bolts Padded storage pouch, no sheath The blade is marked N 00 which would indicate this is a throwing boot knife, but the style is more reminiscent of an All Purpose Hunter. Also, the 00 denotes this knife is one that Ralph Bone made for his own personal use. Near mint condition (there are light scratches on the blade)