Final GMT caliber used in GMT-Master ref. 6542 (succeeded calibers 1036 and 1065). Cal. 1030 base with GMT module. Automatic chronometer movement with butterfly rotor, 18,000 BPH. Also used in some Datejust Chronometer models of the period.
Movement Type
Automatic
Jewel Count
25 jewels
Power Reserve
48h
Frequency
18,000 vph (5 Hz)
Diameter
28.5mm
Height
6.25mm
Rotor Type
central_rotor
Winding
automatic_bidirectional
Shock Protection
kif
