The John Primble Vintage Belknap Louisville KY USA Delrin Serpentine Pen Knife is a classic pocketknife with a unique serpentine design. Made with carbon steel blades and an ambidextrous manual opening mechanism, this original two-blade knife features a slipjoint lock type and a brown Delrin handle. As a collectible piece, this vintage knife is a valuable addition to any knife collection, showcasing the quality craftsmanship of the John Primble brand. Measures 2-7/8" closed, long pull, good springs, blade wear and damage (see photos).