The Black Bay P01, is a watch based on a legendary prototype developed in the late 1960s and proposed to the US Navy, and in so doing lifts the veil on a little-known aspect of its history.

The hinged end-link system on the original prototype was the subject of a patent in 1968, which covered a locking and dismantling system for the bezel to aid maintenance of the watch.

• Manufacture Calibre MT5612 (COSC)
  
• Leather strap 
• 42mm steel case with satin finish
• Lugs: 22mm lug width
• Case thickness: 14.4mm
• 60-notch, 12-hour graduated steel bidirectional rotating bezel with stop system for the bidirectional rotating bezel via a mobile end-link at 12 o'clock
• Waterproof to 200m (660 ft)
• Power reserve of approximately 70 hours
• Five-year transferable guarantee with no registration or periodic maintenance checks required