C06 Yachtsman was a design never produced by Spyderco. A prototype might exist. It was supposed to be a sailors knife, including a Shackle key and a tool for splicing ropes. It's been rumoured there is a new model of this knife in the Works, this time around with H-1 steel. Spyderco showed a prototype at the 2013 Spyderco Amsterdam meet that had Titanium scales and a blade made with Vanax by Bohler-Uddeholm.