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U-Boat Capsoil Capsoil Darkmoon Soleil Green SS Quartz Watch
Color: Green
· Ref: 9502
$1,360$1,600
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Color: Green
Authenticity
Authorized U-Boat dealer
Warranty
Official U-Boat warranty
Shipping
Free · DHL Express
Returns
30 days from delivery
Overview
U-Boat Capsoil Darkmoon 40 Quartz Watch with Green Dial.
The Capsoil line floods the case with a lubricating oil and reads the Darkmoon dial through it, under a bubble that takes up the change in volume as the temperature moves. This one holds the line at 40 mm in bare steel, on a sunray dial read through the oil. The case measures 40 mm in stainless steel 316L.
The Ronda 712.3 quartz calibre drives it.
The brushing on the green dial runs outwards from the centre, so a band of light travels across it as the wrist turns. It is worn on black silicone.
At a glance
- Case filled with oil
- Sunray-brushed dial
- Swiss Ronda 712.3 quartz calibre
- Oil rated for service between 0 °C and 60 °C
- Domed sapphire crystal
- Superluminova on hands and indices
- Screw-down case back
Specs
Type
Quartz
Diameter
40 mm
Crystal
Domed sapphire
Rating
5 atm
Type
Buckle
Country of manufacture
Italy
Movement
Type
Quartz
Calibre
Ronda 712.3
Cold resistance
Up to 0º
Case
Material
Stainless Steel 316L
Diameter
40 mm
Crystal
Domed sapphire
Crown
Screw-down crown
Case back
Screw-down
Dial
Color
Green
Lume
Hands and indices
Lume material
Superluminova
Water resistance
Rating
5 atm
Strap
Material
Silicon
Color
Black
Width
20 mm
Clasp
Type
Buckle
General
Gender
Men
Country of manufacture
Italy
Warranty
3 years
Questions & Answers
What is the oil inside the case for?
It fills the space between the dial and the crystal. Light travels through the oil at close to the same speed as through the crystal, so the reflection drops away and the hands read as if they sat on the surface. An air bubble takes up the change in volume as the temperature moves.
How does the oil behave in the cold?
The house rates the fill for service between 0 and 60 degrees Celsius when the watch is off the wrist. Outside that band the oil changes viscosity and the compensation bubble grows, and the dial clouds until the watch comes back into range, at which point it reads clear again.
Where does the U-Boat design come from?
From a drawing Ilvo Fontana made in 1942 for the Italian naval military forces, a diving watch that stayed on paper. His grandson Italo Fontana revived it in Lucca and built the house around its proportions and around the crown set on the left side of the case.
How long does the Superluminova stay lit?
It is a phosphorescent pigment, so it charges from daylight or a lamp and gives its brightest reading in the first minutes. It fades over the hours after that and takes a fresh charge every time it meets light again.
Who makes the movement?
Ronda, in Switzerland. It supplies calibres to a long list of houses under their own names, which is how a watch assembled in Tuscany carries Swiss movement engineering inside an Italian case.
Still have questions?
Talk to a specialist
Verified Reviews
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 U-Boat packaging, with all official documentation and the U-Boat 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.
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"In stock, ships within 24 hours" or "Only X units left" — the item is in our warehouse and ships the next business day after you order.
"In stock, ships within X days" — the item is held at our secondary warehouse. We allow a few days to inspect and authenticate it before it ships.
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Most in-stock orders arrive within 2–3 business days, depending on your location.
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The price you pay at checkout is the final price of the item delivered to your address.
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Paying by wire, or buying more than one piece? [Contact our team →] and we'll take care of you personally.
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
- Refund to your original payment method — typically 5–10 business days to appear, depending on your bank or card issuer
To qualify for a full refund, the item 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
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