This FB39GP Spyderco Sustain Knife is a serial numbered item; BNIB, made in 2013.
This Spyderco Sustain Knife, based on custom knifemaker Stuart Ackerman's "Slither" design, features a 6.19 inch drop point fixed blade made of CPM 20CV steel, .118 inch thick, with a saber grind, top swedge and a wrist lanyard hole. The Sustain has full tang construction for strength, contoured 3 D machined black G10 scales for secure grip, and a large lanyard hole. A leather sheath is included. The Spyderco Sustain Knife has an overall length of 11.50 inches and it weighs 7.30 ounces. Made in Taiwan in 2013.