Otter-Messer Mercator K55K "Kat" Knife

From Hand Eye Supply: "This simple but extremely rugged pocket knife has been used and manufactured in Solingen, Germany for over 100 years and are virtually unchanged from their original design. The "Mercator" blades were first forged in 1867 by Heinrich Kaufmann & Sohne, Indiawerk. Their reliability made them popular with Kaiser Wilhelm's Army in WWI, and eventually they garnered acclaim from civilians as well. They are virtually indestructible and have been passed down from generation to generation." Available at Hand Eye Supply