U51 Diver Tourbillon

Reference: 0TDCT.E01A.K008D
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Limited Edition: 25 pieces
Case: titanium
Size: 45mm
Movement: hand-wound caliber A-310
Function: tourbillon
Power Reserve: approximately five days
Water Resistance: 300m
Dial: openworked with blue and orange chapter ring
Hands: luminous hands and markers
Caseback: sapphire crystal
Strap/Bracelet: blue rubber
Factory Warranty: two years


The Angelus U51 Diver Tourbillon comes with high technical features while also meeting the required diver’s watch criteria. In fact, the A-310 caliber is dedicated to efficiency, with a silicon lever escapement and with all bridges as plates made of titanium. Furthermore, Angelus’ engineers and watchmakers pushed the boundaries with a remarkable five-day power reserve while keeping the 28,800 vibrations per hour (4 Hz) frequency, ensuring a high precision. Finally, the tourbillon cage is set on a ball bearing instead of pivots to gain stability.

The 45mm titanium case features two large screw-down crowns. The two-position crown at 4 o’clock is used for winding and setting the time, while the crown at 2 o’clock is used to rotate the unidirectional 60-minute rotating bezel. Opposite, at the 9 o’clock position, a helium escape valve is placed to ensure the watch’s water resistance to 300 meters (1,000 feet), even during saturation diving so the helium molecules could not make their way into the case under pressure.