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Ball Engineer M Marvelight Automatic Watch
Color: Black
· Ref: NM2128C-S1C-BK
$3,841
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Color: Black
Authenticity
Authorized Ball dealer
Warranty
Official Ball warranty
Shipping
Free · DHL Express
Returns
30 days from delivery
Overview
With an 80-hour power reserve, the Ball Engineer M Marvelight can sit unworn over a weekend and still be keeping time on Monday.
Ball’s in-house movement
The Engineer M collection honors founder Webster Clay Ball, who set inspection standards for railroad watches after an 1891 train collision at Kipton, Ohio. The collection uses Ball’s manufacture, or in-house, movements. Ball introduced its first manufacture caliber, the 7309, in 2017.
More than three days of power
Inside this Marvelight is the COSC-certified Ball RRM7309-C automatic movement. COSC is the official Swiss institute that tests chronometers for accuracy over 15 days. Fully wound, the movement’s 80-hour power reserve keeps the watch going for more than three days off the wrist.
Easy to read, day or night
The black dial shows the hours, minutes, sweep seconds, and date. Seventeen sealed tritium gas tubes illuminate the hands and hour markers continuously. Tritium inside the glass tubes activates their luminous inner coating. The tubes glow without a battery or any need for prior exposure to sunlight or a lamp.
The details
Anti-reflective sapphire crystals cover both the dial and the case back, which reveals the automatic movement and its winding rotor. The stainless steel case measures 43 mm across and 13.05 mm thick, with a screw-down crown. The watch resists shocks of 5,000 Gs (5,000 times the force of gravity). It also resists magnetic fields up to 4,800 A/m (the international standard for antimagnetic watches). The case is water-resistant to 100 meters.
A stainless steel bracelet closes with a folding clasp.
At a glance
- 17 tritium gas tubes
- Ball RRM7309-C in-house caliber · COSC chronometer · 80-hour power reserve
- Antimagnetic to 4,800 A/m · shock-resistant to 5,000 Gs
Specs
Type
Automatic
Diameter
43 mm
Crystal
Anti-reflective sapphire
Rating
10 atm
Type
Foldover clasp
Country of manufacture
Switzerland
Movement
Type
Automatic
Calibre
Ball RRM7309-C
Power reserve
80 Hours
Frequency
28,800 vph
Jewels
25 jewels
Case
Material
Stainless steel
Diameter
43 mm
Thickness
13.05 mm
Crystal
Anti-reflective sapphire
Case-back crystal
Anti-reflective sapphire
Crown
Screw-down crown
Antimagnetic
4,800 A/m
Impact resistance
5,000 Gs
Dial
Color
Black
Calendar
Date
Lume
Hands and hour markers
Gas tubes
17 Micro gas tubes
Water resistance
Rating
10 atm
Bracelet
Material
Stainless steel
Clasp
Type
Foldover clasp
General
Country of manufacture
Switzerland
Questions & Answers
What can I see through the sapphire back?
The transparent back reveals the Ball RRM7309-C manufacture movement and its automatic winding rotor. The COSC-certified caliber powers the time and date.
Does the gas-tube illumination need charging?
No. This watch uses 17 tritium gas tubes. 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 should I know when wearing the watch again after a break?
Fully wound, the movement can run for 80 hours, a little more than three days. How long it keeps running after you take it off depends on the power already stored in the mainspring. If you wind or set the watch before wearing it again, return the crown to its closed position and screw it fully into the case before contact with water. Correct closure is needed for the rated water resistance.
What does magnetic resistance mean for the movement?
Magnetic fields can disturb a mechanical movement’s rate. Magnetic resistance is rated at 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 test is done before the movement is fitted into the case, so the watch’s daily rate on the wrist can vary.
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The warranty covers manufacturing defects. It doesn't cover normal wear and tear or accidental damage — and on watches, it doesn't cover straps, bracelets, or batteries.
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You have 30 days from delivery to return your order.
How returns work. Just let us know and we'll email you a prepaid DHL Express return label — you never have to arrange a shipment or pay anything up front. The return shipping cost is deducted from your refund. If the item arrived damaged or wasn't what you ordered, the return is on us.
Your refund options.
- Store credit (issued as a gift card) — processed almost immediately once your return reaches us
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To qualify for a full refund, the item must:
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