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@JimmyHAD
Agree to what you said. I have not come across many of this stones and don't think they have been exported to the States or somwhere else in high numbers.
So there are not enough stones...

adrspach,

that's what I have posted, I think that this yellow stones were made of coticule powder (the stones made of y/g thuringian powder don't look yellow, but more greenish/gray).
The...

In the 1920’s the company Johan Gottfried Escher, Sonneberg was split in the companies J.G. Escher and Son und the company JGES (=Johan Gottfried Escher Sonneberg) KG.

After J.G. Escher and Son...