It is evident that Christian Heiden collaborated with Tucher in creating this dial, Tucher making the construction in ivory. There were few families of ivory diptych-dial makers in Nuremberg, and the Tucher family was prominent. From the date of this dial, the most likely member of the family to be concerned here is Hans II, who became master in 1557, and who died in 1615. Christian Heiden (1526-1576) became a teacher of mathematics in Nuremberg, and a number of gilt-brass instruments bear his name. Not only did Heiden present this dial to the Emperor Maximilian II, but he presented the similar dials to the senior Brgermeister and to a member of the City Council. There is no evidence that he was a maker of ivory dials (for Tucher and Heiden, see Gouk, op. cit.).