Georg Hartmann was an early 16th century astrolabe maker. Hartmann’s factory in Nuremberg produced an impressive number of high quality brass and paper astrolabes. An apparent division of labor in Hartmann’s factory allowed some workers to make each part while others later finished and reassembled the instrument.
YPM catalog no. 4.1
Height 0.8 inches (2 centimeters)
Diameter 6.3 inches (16 centimeters)