Ball Watch's in-house manufacture GMT caliber with true GMT functionality via a red 24-hour hand. COSC-certified chronometer based on the RRM7309-CS architecture. Features silicon balance spring and nickel escape components for magnetic resistance up to 2,500 Gauss. Equipped with Ball's patented Amortiser anti-shock system. Powers the Engineer III Endurance 1917 GMT collection.
Movement Type
Automatic
Jewel Count
25 jewels
Power Reserve
70h
Frequency
28,800 vph (8 Hz)
Display Type
Analog
Rotor Type
bidirectional
Shock Protection
Amortiser
BRAND
BALL Watch CompanyTYPE
AutomaticSTATUS
In ProductionMANUFACTURE
In-houseCALIBER FAMILY
RRM73xxCOUNTRY
SwitzerlandALSO KNOWN AS
