Hi Martine, for me I call them "first generation Talhakimt" that were produced earlier in India and became the prototypes for the later produced agate Talhakimts from Germany and all the variations in agate, glass and different kinds of synthetics. They have a different shape and are mostly thicker than those from Idar-Oberstein...Maybe someone can give a time frame for the Indian production...? Nice collection, hard to find nowadays! I have only one...Stay safe!