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Hi Han, here a short Update to put that to this discussion. This is no proof or any direct finding, but this picture is an extract from an old Escher & Co. letter from 1913. The Medals the company...

Han just for asking. Is this really a mottled Thuringian or does it show only one coloration...its not completely visible on the pictures youve shared

It appeared several times in the past. And yes its an Escher & Sohn label....

Probably Hatzicho will chime in if he has further information available...

Nothing more to add then it is an Escher labelled Stone as it has the Escher Cup....Price was ok, but not that cheap as the Size is a smal sized one....but i wish you much fun with this one !!!

it...