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Thank you for the information and document, very interesting reading!
I would have never guessed that the label with the cup was actually used by Escher.

Would you mind if I asked for some...

Sure looks very similar to the one's in the first picture you posted!
Are these darker, grainy looking hones also coarser?

Three-Anchor-Works you say, my second Thuringian hone that I got has...

Apologies for the late reply!
No, I haven't tested the "Erbo" hone, only the other Thuringian I got...
But that honing session didn't end well.
I have still much more to learn about honing and...

As I promised, here are some clearer pictures of the "Erbo" hone in question.

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Here are some more pictures alongside a new hone that I just received, this one looking...

Of course, will try to take some new daylight photos tomorrow.
It's almost 12 AM now in Sweden. [emoji3]

I wouldn't say a tight fit, it doesn't match lengthwise either.
It was "glued" to a wooden base, not the base of the actual box.
It seems to be stuck in there though, it's not loose.

That is my opinion as well, seems coarser than the Thuringians I have studied in photos and honing videos.
It looks rather porous yes, I will try to take some clearer photos in daylight.

Thank you Sir for the reply and some really interesting ideas!

I was under the impression that all Thuringian hones are of finer grit and more suitable for finishing on...
Am I wrong?

This...

Hello Gents,

I recently acquired this REALLY soft, water thirsty, apparently German hone if you go by the box it came in...
It says Erbo on the sticker but I haven't managed to find out anything...