First GMT-Master movement (cal. 1030 with GMT module). Used in ref. 6542 from 1954-1959. COSC chronometer-certified. Featured 24-hour hand and date complication for dual time zone display.
Movement Type
Automatic
Jewel Count
25 jewels
Power Reserve
48h
Frequency
18,000 vph (5 Hz)
Diameter
28.5mm
Height
6.26mm
Rotor Type
central_rotor
Winding
automatic_bidirectional
Shock Protection
kif
