Well had a lot of fun going through those links. The Belgium stuff I had already seen and following links I found this one:

http://www.holzwerken.de/museum/hersteller/deutsch.phtml

While this site had a lot of makers marks I got the impression that they were for lots of tools other than axes.

Then found this one which seems to foucs on chisels:

http://www.alte-beitel.de/hersteller.html

Proof only exists in Mathematics
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