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If this is Droescher's signature you've got the proof you need.

198866

On the label it says: by E.S. which is short for Escher and Son(s). So it is a real Escher and a real Droescher.

Thüringen hones were quarried in Thuringia, Sonnenberg area. Several firms bought the hones from the quarry, stuck their own label on them and sold them on. Eschers being the most famous or fanciest...