Otter Messer Mercator K55K Knife
The American GI's brought this Mercator knife to America after World War II. There it became famous under the name "Black Cat Knife". The designation K55K means "K" for Kaufmann (the original manufacturer), "55" for Hochstrasse 55 (the original company address) and "K" for the symbol cat.It has a lockback and loop for a lanyard. Made in Germany. Read even more about it here.
Blade- 90mm Carbon steel C75, Handle- 110mm Iron Case Black, Weight 75g,