United States. An MC1 Paratrooper Switchblade, by Camillus

A Paratrooper’s switch blade, by Camillus New York, featuring a sharp stainless steel blade with brass sliding lock and release button on the side featuring bright orange isoplaste glass filled nylon, the other device is a steel hook blade knife used for cutting ropes, measures 110 mm (w) x 17.6 mm (h), remains in extremely fine condition.  

Footnote: The MC-1 Paratrooper Switchblade was produced primarily by Camillus Cutlery Company beginning in the late 1950s under U.S. military contract. Officially classified as a survival knife rather than a fighting knife, it was designed for paratroopers and aircrew who needed a compact, one-hand-operable cutting tool in emergencies. The knife features a spring-activated main blade that deploys via a push button, along with a separate folding hook blade (shroud cutter) specifically intended for cutting parachute lines, webbing, or harness straps without risking injury from an exposed edge. Many examples were produced with bright orange handles for visibility against flight gear. Although innovative in concept, the MC-1 developed a mixed reputation due to occasional reliability issues with its locking and spring mechanism. In addition to Camillus, other contractors such as Schrade manufactured variants over the years. Production for military contracts continued into the early 1990s, after which the design was phased out in favor of more modern rescue tools. Today, the MC-1 is primarily valued as a collectible piece of Cold War–era military equipment rather than as a practical field knife.