Authorized U-Boat Retailer
U-Boat Capsoil Darkmoon Curve Camouflage Quartz Watch
Color: Grey
· Ref: 9551
$1,350$1,600
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Color: Grey
Authenticity
Authorized U-Boat dealer
Warranty
Official U-Boat warranty
Shipping
Free · DHL Express
Returns
30 days from delivery
Overview
U-Boat Capsoil Darkmoon Curve Quartz Watch with Grey 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 curves the dial itself under the dome, so the numerals bend away towards the rim. The case measures 40 mm in PVD.
The Ronda 712.3 quartz calibre drives it.
The camouflage is painted into the grey dial itself, so the pattern sits under the grey numerals and hands as part of the same surface. The PVD coating carries the black across the bezel and the crown guard in one tone. It is worn on black silicone.
At a glance
- Case filled with oil
- Camouflage 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
PVD
Diameter
40 mm
Crystal
Domed sapphire
Crown
Screw-down crown
Case back
Screw-down
Dial
Color
Grey
Lume
Hands and indices
Lume material
Superluminova
Water resistance
Rating
5 atm
Strap
Material
Silicon
Color
Black
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.
How is the battery changed on a watch full of oil?
Through a locking ring in the case back that a watchmaker opens and closes on the bench, with the oil topped up at the same time. The design exists so the service is done locally, and the watch stays out of the factory.
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.
What is the coating on the case?
Physical vapour deposition. The coating metal is vaporised in a vacuum chamber and bonded to the steel as a hard layer, which holds up to daily abrasion far better than electroplating of the same thickness.
Still have questions?
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Verified Reviews
FAQ
Yes, we are an Official U-Boat Authorized Dealer, and an authorized dealer for every brand we carry.
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.
You'll find availability on every product page, right above the Add to Cart button. Here's what each status means:
"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.
"Check delivery date" — the item 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 delivery date.
Need something by a specific date? Tell us and we'll check before you buy. [Contact our team →]
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- Orders from $150 to $249.99 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 2–3 business days, depending on your location.
No, the price you see at checkout is the price you pay — nothing else.
The price you pay at checkout is the final price of the item delivered to your address.
DHL will never ask you for a payment on delivery, and no surprise invoice arrives afterward.
No handling charges, no processing fees, nothing added at the door.
We accept all major credit and debit cards, Apple Pay, Google Pay, PayPal, and bank wire transfer.
- Credit and debit cards — Visa, Mastercard, American Express
- Apple Pay and Google Pay — one-tap checkout, nothing to type
- PayPal — with PayPal Buyer Protection on every purchase
- Bank wire transfer — often the preference on higher-value orders
Every transaction is fully encrypted, and we never store your card details.
Financing. Choose PayPal at checkout and you may be offered the option to split your purchase into payments or finance it over time, including interest-free plans on qualifying orders. You'll see exactly what's available for your order before you confirm — plans, terms, and eligibility are set by PayPal and subject to their approval, with no obligation to take it.
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
Not sure whether something qualifies? Ask us before you ship it back — we'll tell you straight. Contact our team.
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Still have questions?
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