Got lucky in the wild recently and thought I'd share a few pics, since I couldn't find any others around here. There was a thread a while back where hatzischo (I think) posted an old catalogue of one of these. As far as I understand these were kind of the successors to the Barbers Gem after Escher became a part of the Deutsche Schleifmittel AG (please correct me if I'm wrong).
Size: 13 x 5 x 1.3 cm
Enjoy
