Tudor Pelagos FXD MN 21 Certified Chronometer

Tudor Pelagos FXD MN 21 model reference 25707B/21 complete with box and papers with two Tudor straps. It dates to 2021, mint condition and one of only around 150 pieces of this model made in that year. Since the 1950s and TUDOR's creation of one of the first modern professional divers' watches to the 1980s, the brand has been an official supplier to the Marine nationale (French Navy). With the Pelagos FXD model, where FXD refers to the extra robust FiXeD strap bars of the case, TUDOR is reviving this historic collaboration.

Developed to a set of unique specifications created in collaboration with a specialist unit of the French Navy, the Pelagos FXD model is designed for underwater navigation and optimised for professional use.

Underwater navigation consists of reaching a precise location by sea, without surfacing, by following a meticulously planned route. Divers carry out this underwater navigation in pairs, connected to one another by a strap known as a "life line", and complete a series of straight swims guided by a magnetic compass. They swim at a constant speed for a set time in each section, completing as many sections as necessary whilst timing each one exactly.

Underwater navigation entails restarting a countdown at each change of course. The anticlockwise graduation and luminescence of the bezel of this model make it easy to set up and monitor each countdown, by aligning the time set for the section to be covered on the bezel with the minute hand.

When the minute hand arrives opposite the triangle, the team changes course and the diver in charge of timing begins the next countdown. The Pelagos FXD has also been fitted with a large bezel ring, which exceeds the diameter of the case for optimum grip, even with neoprene gloves and hands that are numb from long dives in cold water.

First Image in sequence is a catalogue image. 

Case

Titanium case, 42mm in diameter, 12.75mm thick, 52mm from lug to lug, satin-brushed finish
Fixed bracelet bars
Steel case back
Lugs: 22mm lug width
Case thickness: 12.8mm

Movement
Manufacture Calibre MT5602 (COSC)
Self-winding mechanical movement with bidirectional rotor system

Power Reserve
Power reserve of approximately 70 hours

Winding Crown
Titanium crown, adorned with the TUDOR shield in relief

Waterproofness
Waterproof to 200m (660 ft)

Bezel
Bidirectional rotating bezel in titanium with ceramic disc, 60-minute retrograde graduation for navigation by successive stages

Dial
Navy blue

Crystal
Sapphire crystal

Bracelet
Fabric strap with self-gripping fastening system, navy blue with grey central thread
Complimentary navy blue rubber strap with woven motif and titanium buckle, included in the box