The U-Boat Darkmoon Black 44 PVD has a black dial immersed in oil, with an air bubble that drifts across it as your wrist moves.
The oil-filled dial
Oil around the black metal dial adds visual depth and makes the domed sapphire crystal above it seem to disappear. Once charged by light, Super-LumiNova on the hands and hour markers helps you read the time in the dark.
The Swiss Ronda 712.3 quartz movement sits in the same oil bath as the dial. The bubble is there by design, leaving room for the oil to expand and contract as the temperature changes. When the watch is off your wrist, U-Boat specifies a temperature range of 32–140°F (0–60°C).
Rooted in a 1942 naval design
The left-side crown comes from Ilvo Fontana’s 1942 plans for an Italian Navy watch that was never built. His grandson Italo revived the design in Lucca. On the Darkmoon, the screw-down crown has a double security system.
The details
The 44 mm case is 316L stainless steel with a black PVD finish and is water-resistant to 50 meters. The Locking Ring System on the back gives access to the battery.
The black vulcanized rubber strap carries a raised U-Boat logo and measures 22 mm at the lugs. It closes with a steel pin buckle finished in black PVD. The watch is made in Italy.
The bubble is an intentional part of the oil-filled construction. It leaves room for the oil to change volume with temperature and moves as the watch changes position.
The Locking Ring System has a compartment for battery replacement. Oil adjustment uses a separate service opening reserved for U-Boat’s specialized technicians.
Keep it within U-Boat’s stated 0–60 °C range, away from prolonged direct sunlight, heat sources, and large temperature changes.
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.
Yes — free DHL Express shipping on all orders over $250 (US only).
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 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.
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'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 →]
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.
To qualify for a full refund, the item must:
Not sure whether something qualifies? Ask us before you ship it back — we'll tell you straight. Contact our team.
Our specialists are here before and after you buy — no pressure, no obligation. Authorized dealer, official warranty, and guaranteed authenticity on every piece.







