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Ball Engineer Hydro. AEROGMT II Automatic Watch
Color: Blue
· Ref: DG2118C-S9C-BE
$4,819
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Color: Blue
Authenticity
Authorized Ball dealer
Warranty
Official Ball warranty
Shipping
Free · DHL Express
Returns
30 days from delivery
Overview
The 40 mm Ball Engineer Hydrocarbon AeroGMT II keeps three time zones readable day and night, with tritium tubes lighting its blue dial and sapphire bezel.
Three time zones at once
Developed for commercial pilots, the AeroGMT II shows home time, local time, and a third time zone on one dial. The main hands show local time. The separate GMT hand points to home time on a fixed 24-hour scale. Turning the bidirectional bezel brings a second 24-hour scale into line with the same hand, so you can also read the time at another destination.
Both 24-hour scales distinguish day from night, so you can see at a glance whether it is morning or evening in the other zones. The watch is built for days that start in one time zone and end in another, from a red-eye flight to a morning meeting abroad.
Lit by 44 tritium tubes
The curved sapphire bezel carries an illuminated 24-hour scale. In all, 44 sealed tritium micro gas tubes light the hands, the hour markers, and the bezel markings. Each tube produces its own continuous light, without a battery or any need to be charged in sunlight or under a lamp. An anti-reflective sapphire crystal covers the blue dial and date display.
Protected against magnetism
Webb C. Ball made magnetic resistance one of his railroad watch requirements after the 1891 train collision at Kipton, Ohio. Ball has treated magnetism as a threat to accuracy ever since. The watch is built to withstand shocks of 7,500 Gs (7,500 times the force of gravity). It also resists magnetic fields up to 4,800 A/m (the international benchmark for anti-magnetic watches). The case is water-resistant to 100 meters.
The details
The stainless steel case measures 40 mm across and 14.5 mm thick. A patented crown protection system helps keep the crown securely closed. Inside, the COSC-certified Ball RR1201-C automatic movement provides a 42-hour power reserve. COSC, the official Swiss institute that certifies chronometers, tests each movement for 15 days.
The stainless steel bracelet closes with a patented triple-folding clasp rated to withstand a force of 1,400 newtons (about 315 pounds of force).
At a glance
- GMT, third time zone
- 44 tritium gas tubes
- Ball RR1201-C · COSC chronometer · 42-hour power reserve
- Antimagnetic to 4,800 A/m · shock-resistant to 7,500 Gs
- Bidirectional rotating bezel · patented crown protection
Specs
Type
Automatic
Diameter
40 mm
Crystal
Anti-reflective sapphire
Rating
10 atm
Type
Buckle with folding clasp
Country of manufacture
Switzerland
Movement
Type
Automatic
Calibre
Ball RR1201-C
Power reserve
42 Hours
Frequency
28,800 vph
Jewels
21 jewels
Case
Material
Stainless steel
Diameter
40 mm
Thickness
14.5 mm
Crystal
Anti-reflective sapphire
Crown
Patented crown protection system
Antimagnetic
4,800 A/m
Impact resistance
7,500 Gs
Dial
Color
Blue
Calendar
Date
Lume
Hands, hour markers and bezel
Gas tubes
44 H3 Gas tubes
Water resistance
Rating
10 atm
Bracelet
Material
Stainless steel
Clasp
Type
Buckle with folding clasp
General
Country of manufacture
Switzerland
Questions & Answers
How do I read the three time zones?
The main hands show local time, and the GMT hand reads a second zone on the fixed 24-hour scale. Turn the bidirectional bezel to read that same GMT hand against another 24-hour scale for a third zone.
How do the travel scales stay illuminated after dark?
The 44 tubes illuminate the hands, hour markers, and sapphire bezel scale, keeping the time-zone readings visible after dark. Inside each sealed glass tube, tritium activates a luminous coating. The tubes glow continuously, without a battery or any need to be charged by sunlight or a lamp. The glow gradually fades as the tritium decays, with a half-life of about 12.3 years.
What does magnetic resistance mean for the movement?
Magnetic fields can disturb a mechanical movement’s rate. This watch has magnetic resistance to 4,800 A/m. Stronger fields can exceed that protection.
What does COSC certification mean for this movement?
The movement passed independent chronometer testing over 15 days, in five positions and at three temperatures. The permitted average daily rate during testing is -4 to +6 seconds. The traditional test is performed before the movement is fitted into its case; its daily rate on the wrist can vary.
What does the Hydrocarbon crown guard do?
The patented guard protects the crown against impacts and helps ensure that it is properly closed. Both the crown and guard must be secured before the watch is exposed to water.
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