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Authorised U-Boat Retailer
U-Boat Sommerso Ghiera Ceramica Bordeaux Automatic Watch
Colour: Black
· Ref: 9521/MT
£3,050
15%
off with your code
Apply it at checkout · Your price: £2,592.50
Colour: Black
Authenticity
Authorized U-Boat dealer
Warranty
Official U-Boat warranty
Shipping
Free · DHL Express
Returns
30 days from delivery
Overview
U-Boat Classico Sommerso Ghiera Ceramica Automatic Watch with Black Dial.
Descended from the diving watch Ilvo Fontana drew in 1942 for the Italian naval forces, the Classico line carries the left-hand crown that drawing placed there. The Classico Sommerso Ghiera Ceramica sets the ceramic insert on the 316L steel bracelet, with a deployant clasp. Stainless steel, 46 mm in diameter.
A U-28 automatic movement powers the hours, minutes, seconds, date and a 24-hour indicator beneath a sapphire crystal with anti-reflective treatment and a lens over the date window. The crown screws down on the left under a patented protective device, and seven external screws seal the case back. The 24-hour hand and the reference on the minute hand are picked out in red.
Two-tone, bordeaux at the top and black at the foot under a plain black ceramic bezel, the dial is built from three superimposed dials with a visible ruby and numerals framed in brushed metal. Hands, numerals and indexes are treated with white Super-LumiNova for legibility in the dark, and it is delivered on a 316L stainless steel bracelet, secured by a deployant clasp.
At a glance
- 24-hour indication
- Unidirectional dive bezel
- Black ceramic bezel insert
- U-28 automatic calibre
- 38-hour power reserve
- 30 atm water resistance
- Magnified date aperture
Specs
Movement
Type
Automatic
Calibre
U-28
Power reserve
38 Hours
Frequency
28800 A/h
Jewels
25 jewels
Case
Material
Stainless steel
Diameter
46 mm
Crystal
Sapphire
Crown
Patented crown protection system
Case back
Screw-fastened
Dial
Color
Black
Calendar
Date (magnified)
Lume
Hands and indices
Water resistance
Rating
30 atm
Bracelet
Material
Stainless steel
General
Gender
Men
Country of manufacture
Italy
Warranty
3 years
Questions & Answers
Why does the crown sit on the left?
It comes from a watch Ilvo Fontana drew in 1942 for the Italian naval forces, a diver whose crown sat on the left so the hands could be set from that side. His grandson Italo Fontana founded U-Boat in Lucca around that drawing, and the patented clamp over the crown is the part he added.
What does the 24-hour indication tell you?
A hand that turns once a day against a track marked from 1 to 24, so a glance separates morning from evening on a dial whose hour hand turns twice. Marine and aviation logs keep a 24-hour clock, which is where the reading comes from.
How does the ceramic insert hold up?
Ceramic is fired to a hardness above that of hardened steel, and it holds its color under sunlight and salt water, so the scale on the bezel stays legible for the life of the watch. It is brittle in exchange, so the edge is what to keep away from a hard knock.
Why does the dive bezel turn one way only?
Set the marker to the minute hand at the start of a dive and read the elapsed time off the scale. Because the bezel turns in a single direction, any knock can only shorten the time it shows, which errs on the side of surfacing early.
What is the stone at 6 o'clock?
A ruby set into the dial. It is purely decorative, and it marks the Sommerso dials the way the serial plate on the case flank marks the case.
Still have questions?
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FAQ
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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. [Contact our team →]
Questions about a specific piece? Our specialists are happy to help.
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- Orders from £150 to £399.99 ship DHL Express for a flat £9.90
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Most in-stock orders arrive within 1-2 working days of dispatch.
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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 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
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