West German pottery dish with orange fat lava glaze

This unusual triangular dish has a width of approximately 25cm (10 inches) and was made in West Germany in the 60's or (more likely) the 70's. Its manufacturer is believed to be either Emons & Söhne Keramik (aka ES Keramik) or Scheurich<. The greasy orange lava glaze suggests the former attribution is perhaps the most likely. The dish is in excellent condition with no damage.