The Famous Case XX Trademark
The history of the trademark goes back to the early days of W.R. Case & Sons Cutlery Co., when the "XX" was used as a quality check system during the process of heat-treating. When the blades were put through the initial hardening furnace, an "X" was marked on the pan holding the blades. When the blades were returned to the oven for tempering, a second "X" was added. "XX" then showed that each blade had been properly and fully treated.

Today, the Case "XX" trademark is a distinction of the quality that is placed into each knife.

California Clip - This version is slightly different from that of the standard clip utility blade in that it is shaped like the state of California.

Can Opener - This is used to open can. Most popular with campers.

Clip Blade - This is commonly used as a multi-purpose blade and is preferred for its versatility.

Coping or Cut-off Pen Blade - This is used commonly in carpenter's knives to scratch lines in wood or other materials. It is also used for carving and whittling.

Drop Point Blade - This is used for gutting larger game animals.

Electrician's Blade - This is used as a screw driver and wire scraper and was designed to be used as an electrician's knife.

Fillet Blade - It's Flexibility and design is intended for filleting fish as well as serving as an all-purpose utility tool.

Fish Scaler Blade - This special serrated design allows ease in scaling fish. The hook disgorger on the tip of the blade is used to remove the hook from the fish's mouth.

Fork Blade - This is used as a utensil for eating. The Cap Lifter feature is used for opening bottles by lifting the cap.

Long Spear or Physician's Blade - This is used for scooping powder from vials and loosening caked powder. (It also could be have been used as a back up tool during surgery when surgical instruments were unavailable.)

Manicure Blade - This is used to file fingernails.

Marlin Spike Blade - The long narrowing form of this allowed the user to untie knots. It is aso used to aid in weaving rope.

Pen Blade - This blade was engineered to cut and sharpen turkey quills that were used for ink pens. It also serves as a great blade for light work.