Single Blade 1980 CASE XX USA 5159 L SSP Stag Hammerhead Sportsmen's Lockblade Pocket Knife. 4-7/8 inches closed. 8-1/2 inches open. Made in USA. "Case XX *****SS***** USA" (10 dot with lightning bolt S) and "5159 L SSP" tang stamps. Stainless Steel blade etched with hammerhead shark image. Brass Bolsters deep-etched with a single oval Case logo. Stag handle. With original box, leather sheath, and paperwork.