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There are more, indeed. And i have save them ad home. They are very fouled so I hat to clean them up first. 2 of them looking very attrctive, glued in wooden paneels

Thanks guys for your input.
In the case of the first stone there was, as says in Germany, "the wish the father of thought" (do not know whether there is a comparable speech in English). Amazing...

I have already applied it to an SR. Slurry from a coticule, finish with water only was a very good shave possible - clouse and comfortable

Synthetic? with me? - Devil escaped!:shrug:

The question then would be how such a Novaculite (Arkansas) could have reached Thuringia.

No. It was just dusty and smelled of diesel, probably because it was stored between oil flaps

The second hone is puzzling. From the outside it could be considered a Coticule. Size 180 X 55 mm, weight about 650g. But he is hard, I mean really pretty pretty hard . He is harder than my Ohzuku...

I have received these 2 hones a few weeks ago from the workshop of an older gentleman from mid-80 (he collects and restores tractors). He got it again about 50-60 years ago from the workshop of a...