Authorised Ball Retailer
Ball Engineer M Skindiver III Automatic Watch
Colour: Blue
· Ref: DD3100A-S1C-BE
£3,340
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15%
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Apply it at checkout · Your price: £2,839.00
Colour: Blue
Authenticity
Authorized Ball dealer
Warranty
Official Ball warranty
Shipping
Free · DHL Express
Returns
30 days from delivery
Overview
With 300 meters of water resistance and an 80-hour power reserve, the Ball Engineer M Skindiver III is a limited-edition diver with a luminous sapphire bezel.
A luminous sapphire bezel
The unidirectional sapphire bezel carries a luminous scale for measuring elapsed time. On a swim or a snorkeling trip, the bezel keeps track of your time in the water.
Framed by the sapphire bezel, a domed, anti-reflective sapphire crystal rises above the dial. The blue dial also displays the date. Thirty-two sealed tritium gas tubes keep the hands and hour markers illuminated continuously. They need no battery and do not have to be charged by sunlight or a lamp.
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. Like the rest of the collection, the Skindiver III uses a Ball manufacture movement, the COSC-certified RRM7309-C caliber. COSC is the official Swiss institute that tests chronometers for accuracy over 15 days.
80 hours of power reserve
Fully wound, this automatic caliber provides an 80-hour power reserve, enough to keep the watch going for more than three days off the wrist.
The details
This limited edition of 1,000 watches has a stainless steel case measuring 40.5 mm across and 14 mm thick. With its screw-down crown, the case is water-resistant to 300 meters. In Ball’s patented Amortiser system, a protective ring around the movement absorbs lateral shocks before they reach the mechanism. Magnetic resistance is rated at 4,800 A/m (the international standard for antimagnetic watches). A 20 mm stainless steel bracelet closes with a folding clasp.
At a glance
- Limited to 1,000 watches
- 32 tritium gas tubes
- Ball RRM7309-C in-house caliber · COSC chronometer · 80-hour power reserve
- Antimagnetic to 4,800 A/m
- Unidirectional rotating sapphire bezel
- 30 atm water resistance
Specs
Movement
Type
Automatic
Calibre
Ball RRM7309-C
Power reserve
80 Hours
Frequency
28,800 vph
Jewels
25 jewels
Case
Material
Stainless steel
Diameter
40.5 mm
Thickness
14 mm
Crystal
Domed anti-reflective sapphire
Crown
Screw-down crown
Antimagnetic
4,800 A/m
Shock system
Patented Amortiser® system
Product
Limited edition
1000 units
Dial
Color
Blue
Calendar
Date
Lume
Hands and hour markers
Gas tubes
32 Micro gas tubes
Water resistance
Rating
30 atm
Bracelet
Width
20 mm
Material
Stainless steel
Clasp
Type
Foldover clasp
General
Country of manufacture
Switzerland
Bezel
Material
Sapphire
Rotation
Unidirectional
Questions & Answers
How does the sapphire bezel help measure elapsed time?
Its scale can be used to time an interval while the main hands continue to show the time. The bezel turns in one direction around the separate domed sapphire crystal that covers the dial. Its luminous scale can also be read after dark.
Does the gas-tube illumination need charging?
No. This watch uses 32 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.
How long can I leave the watch unworn?
Fully wound, the movement can run for 80 hours, a little more than three days. The time remaining when you take it off depends on how much power is already stored in the mainspring.
How does Amortiser protect the movement?
Ball’s Amortiser system uses a protective ring around the movement to absorb energy from lateral shocks, reducing the force transmitted to the mechanism inside.
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.
What helps preserve the watch’s water resistance?
Water resistance depends on the condition of the seals and correct closure of the crown and case. Seals age over time, so water resistance can decline unless the seals are checked and replaced. Follow Ball’s care and service instructions.
Still have questions?
Talk to a specialist
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FAQ
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With over 15 years in the luxury market, we guarantee the authenticity and quality of every piece we sell.
Your order arrives brand new in its original Ball packaging, with all official documentation and the Ball warranty card, stamped and dated by us.
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.
Questions about a specific piece? Our specialists are happy to help. [Contact our team →]
Questions about a specific piece? Our specialists are happy to help.
Yes — free DHL Express shipping on all UK orders of £400 or more.
- Orders from £150 to £399.99 ship DHL Express for a flat £9.90
- Orders under £150 ship DHL Express for a flat £19.90
Every order ships with a tracking number, so you can follow your package every step of the way. Shipments are fully insured and delivered by DHL Express with signature required.
Most in-stock orders arrive within 1-2 working days of dispatch.
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"Dispatched next working day" or "Only 1 left" — the piece is in our warehouse and leaves the working day after you order.
"Dispatched within X working days" — the piece is held at our secondary warehouse. We allow a few days to inspect and authenticate it before dispatch.
"Check delivery date" — the piece is available to order, but we confirm the exact date with the brand. As soon as you order, we contact the manufacturer and email you an estimated date.
Need something by a specific date? Tell us and we'll check before you buy. [Contact our team →]
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 cost is deducted from your refund. If the piece arrived damaged or wasn't what you ordered, the return is on us.
Your refund options.
- Credit (issued as a gift card) — processed almost immediately once your return reaches us
- Refund to your original payment method — typically 5–10 working days, depending on your bank
To qualify for a full refund, the piece must:
- Be unused and in perfect condition, with no signs of wear
- Include its original packaging and outer box
- Include all original documentation, accessories, and the warranty card
- Not be engraved or personalised — custom pieces are made to order and can't be returned
Not sure whether something qualifies? Ask us before you ship it back — we'll tell you straight. Contact our team.
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