HI guys!
Well, they offer different types of the Mercators here in Germany. Big ones, small one, with or without that "backlock". But all are very nice working knives. Nothing really for sunday, but for an good EDC they are fine, I think.
I think I should explain what the K55K means... that´s interessting (imo)
K = Kaufmann (family name of the inventor of that knife)
55 = House Nr. 55 at the Hochstrasse in Solingen I think
K = Katze which means Cat in English language.
They are built the same way since 1867 by Otter Messer, Solingen. The family Kaufmann invited them, but let them build unter contract to get an utility knife for the german troops in the german colonies. The Mercator knives were also carried during WWI and WWII buy german soldiers as standart pocket / utility knives.
In Germany on older products you can find any of these numbers and letters. Here we have an old parfume (usually used by very, very old ladies). It´s called Kölsch Wasser (Cologne Water) and has the 4711. That means, this was the adress where the parfume was made first. In Cologne at the House Number 4711 (at that times, the numbers were given in different ways, no street names - just numbers). Sorry for getting OT.
Kind regards
Andi