I used to deal in cutlery back in the 80s and 90s, just as a sideline. I was able to take trades from customers, and although most were junk that got traded in, once in a while I got a nice old knife.
People were not inclined to want "old" pocket knives, so many are still in my "cigar box" collections. I took an
old Mercator in trade, but being unfamiliar with the knife, I just tossed it in my tool box and forgot about it.
I Did know that it was a German made knife, and was used by many of the German troops during WW2.,
but that ius about as far as it went.
I retired from that job in1998, and took my tool chest and roll-around home, and used it little since. Even
when I did use the tools, I paid little attention to the knife..just left it there in the box.
I happened to be working on a couple blades this morning, and upon seeing the Mercator again, I decided to search it out a bit more.
Seems like the company started way back, and first offered this design in 1867, and was a favorite of Kaiser Wilhelm. So those 'soldaten' who could afford it, bnought one to carry in WW1 and WW2.
Researching further, I found that my particular knife was made just before or just after the end of WW2..and could be quite valuable.. a couple Benjamins anyway...
Surprisingly, the knife is still being made and sold, now by Otter works of Solingen. It is slightly smaller than mine, 7,75" vs mine at 9" , (closed 4.25" and 5.0" respectively) but it has that great, old German carbon steel that built Solingen's reputation.
Knife Center has them on a sale now.. $30..while most offer it from $49 to $52.. I may just get one, since good German knives are hard to come by these days...and some folks are paying that much for some Chinese knives..
https://www.knifecenter.com/item/K55/otter-mercator-solingen-k55-black-cat-knife-german-carbon-steel-army-issue