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Ball Engineer III Endurance 1917 GMT Automatic Watch
Color: Blue
· Ref: GM9100C-S2C-BER
$4,050
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Color: Blue
Authenticity
Authorized Ball dealer
Warranty
Official Ball warranty
Shipping
Free · DHL Express
Returns
30 days from delivery
Overview
Ball Engineer III Endurance 1917 GMT pairs a blue dial with an independently adjustable local hour hand and a 41 mm case of 904L stainless steel.
The Endurance 1917 GMT is designed to make local-time changes straightforward. Its Ball Manufacture RRM7337-C caliber lets the local hour hand jump in one-hour increments while the GMT hand and seconds continue running undisturbed. The date follows the local hour hand, keeping the calendar aligned with the time at your destination. You can adjust local time without resetting your home-time reading or stopping the watch. This edition is limited to 1,000 watches.
Thirty-nine sealed tritium tubes illuminate the hands and dial without an external charge. The GMT hand reads a 24-hour scale, distinguishing day and night in a second zone, while a magnifier enlarges the date. The COSC-certified movement uses oil formulated for temperatures down to -45°C.
Inside the 904L stainless steel case, a mu-metal shield redirects static and low-frequency magnetic fields around the movement. Made from nickel, iron, copper, and molybdenum, it helps keep those fields from affecting the movement’s rate, with magnetic resistance to 80,000 A/m (1,000 gauss). A protective Amortiser ring absorbs lateral shocks, so the construction addresses both magnetic interference and physical impacts.
The case measures 41 mm across and 13.15 mm thick, with an anti-reflective sapphire crystal and screw-down crown. Water resistance is rated at 10 atm. A 904L stainless steel bracelet closes with a folding clasp.
At a glance
- Limited to 1,000 watches
- Mu-metal magnetic shield
- GMT with independently adjustable local hour hand
- 39 tritium gas tubes
- Ball RRM7337-C in-house caliber · COSC chronometer
- Antimagnetic to 80,000 A/m — 1,000 Gauss · Amortiser® shock system
Specs
Type
Automatic
Diameter
41 mm
Crystal
Anti-reflective sapphire
Rating
10 atm
Type
Foldover clasp
Country of manufacture
Switzerland
Movement
Type
Automatic
Calibre
Ball RRM7337-C
Cold resistance
Down to -45°C
Case
Material
904L stainless steel
Diameter
41 mm
Thickness
13.15 mm
Crystal
Anti-reflective sapphire
Crown
Screw-down crown
Antimagnetic
80,000 A/m
Shock system
Patented Amortiser® system
Magnetic shield
Mu-metal
Product
Limited edition
1000 units
Dial
Color
Blue
Calendar
Date (magnified)
Lume
Hands and hour markers
Gas tubes
39 Micro gas tubes
Water resistance
Rating
10 atm
Bracelet
Material
904L Stainless steel
Clasp
Type
Foldover clasp
General
Country of manufacture
Switzerland
Questions & Answers
How does the independent local hour hand help when traveling?
Use the crown to move the local 12-hour hand in one-hour steps. The GMT hand keeps its existing reading and the seconds continue running, so home time is undisturbed. The date follows local time as the hour hand moves. This travel-oriented arrangement is often called a true GMT.
How do I distinguish day and night in the second time zone?
Read the GMT hand against the fixed 24-hour scale on the dial. It shows a second zone alongside local time, with a full day represented on the scale so morning and evening can be distinguished.
Does the gas-tube illumination need charging?
No. This watch uses 39 tritium gas tubes. Tritium inside each sealed glass tube activates a luminous coating continuously, without a battery or prior exposure to light. The glow gradually fades as the tritium decays, with a half-life of about 12.3 years.
How do Amortiser and the magnetic shield protect the Endurance 1917 GMT?
Amortiser surrounds the movement with a protective ring that absorbs energy from lateral shocks. A mu-metal shield redirects static and low-frequency magnetic fields around it, helping keep them from disturbing its rate. The watch is rated to 80,000 A/m (1,000 gauss); stronger magnetic fields can exceed that protection.
What does COSC certification mean for this movement?
It passed independent chronometer testing over 15 days, in five positions and at three temperatures. The permitted average daily rate during the test is -4 to +6 seconds. This traditional test is performed before the movement is cased, so the watch’s rate in daily wear can vary.
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