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For sure a thuringian Stone. And yes seemd to be a yellow green stone. The quality should be on par like Escher Stones even if it doesnt show a label

What i can add is that both labels are documented Schleifmittel Aktiengesellschaft (SAG) labels, which still let me think that later articles of Friedrich Müller just should look like the products of...

My theory is still that Friedrich Müller just wanted to use a comparable style which was used from SAG before.

Ive seen an Oilstone (Corum) last month which showed the "Eagle" and a Word Mark...

Probably a thuringian Hone or a Schwedenstein, just google Schwedenstein hone and youll find a lot of info