SPD Invictus™ ALPHA - Calavera Cutlery


Prometheus Design Werx's signature, mid-sized folder design as custom made by Calavera Cutlery (Jeremy Robertson). Purpose driven, engineered, edged tool hand made by a former airline pilot turned knife maker.

Precision machined and hand-ground in CA, the Invictus™ ALPHA folder design is an instantly recognizable aesthetic and styling, characteristic of a purpose driven, lifelong design direction, and ethos. This folder is inspired by and takes its design cues from the tried and trued millennia old spear point blade silhouettes, to the tapered capsule shapes, streamlined arcs, and the purposeful fluting and texturing of the modern machine age as found in high grade tools to precision barrels. Coming in at a mid-sized blade length, this folder is a high end custom edged tool for users and collectors who prefer a 3.5" blade length in their folding knives. The Calavera Cutlery iteration of the Invictus™ ALPHA features a hand ground concave blade, our SPD mark, the maker's mark, handle fullers, billet pocket clip, lanyard pin, secure robust jimping through-out, and a zirconium backspacer.


  • Blade Material: CTS-XHP
  • Handle Material: 6AL4V Titanium
  • Backspacer: Zirconium
Approx. Dimensions:
  • OAL: 8"
  • Blade Length: 3.5"
  • Cutting Edge: 3.25"
  • Blade Thickness: .16"
Approx. Weight:
  • 8.3 oz
  • Locking Type: Frame Lock
  • Pocket Clip: Tip Up
  • Acid Etched Robertson USA Logo
  • Acid Etched SPD Logo
Made In:
  • California
  • Patented