Some knife designs come and go. The Mercator Black Cat K55K has remained in use for well over 100 years because it simply works.

Originally produced in Solingen, Germany, this folding knife combines a slim steel handle with a 90mm (3.5 inch) carbon steel blade in a design that has earned a reputation for reliability and straightforward practicality. The blade locks open using a backlock mechanism, while the narrow profile keeps the knife easy to carry in a pocket without adding unnecessary bulk.

The famous Black Cat emblem has become part of the knife's identity. Stamped into the handle and painted by hand after coating, it reflects the same traditional manufacturing approach that has helped keep the design largely unchanged for generations.

At just 75g (2.6oz), it carries lightly but still feels substantial in hand. A good choice for those who appreciate proven designs, quality German manufacturing, and a folding knife with genuine historical character.

Key Features

• Carbon Steel Blade: C75 carbon steel offers strong cutting performance and is easy to maintain with proper care.
• Historic Solingen Design: Produced in Germany using the long-established Mercator pattern trusted for generations.
• Slim Pocket Profile: Narrow steel construction keeps weight down while remaining easy to carry.
• Lockable Backlock: Secures the blade during use for added confidence when handling cutting tasks.
• Black Powder-Coated Handle: Durable finish helps protect the steel handle while maintaining the knife's classic appearance.
• Hand-Painted Cat Emblem: Features the iconic Black Cat logo that made the K55K famous internationally.
• Lightweight Construction: Weighs just 75g (2.6oz), making it comfortable for everyday carry.