Hello, colleagues!

This blade inscription often appears on Solingen-made blades of the second half of the 1800s. Eisenhauer, i.e. an 'iron-cutter' marked blades indicated a particularly high quality [nothing more than a marketing trick, in my opinion].
However, I have seen at least two blades marked Eisenhauer, which, at least in their appearance, may date well prior to the 1850s, perhaps into the 1700s.
What is the earliest example of the blade marked Eisenhauer that you have seen?

Anybody?
I'm looking for info on the particular company which coined the term Eisenhauer. According to the examples I have seen, it appears to date from the mid-1850s.

Hello Dmitry,

I know the marking "Eisenhauer" only since the middle of the 19th century. Can't help, unfortunately.

Thomas