Zenith Defy Revival A3648

Technical specifications


  • Hours
  • Minutes
  • Seconds
  • Date


  • Self Winding/Automatic
  • Manufactured
  • Swiss Made


  • Octagonal
  • Stainless steel
  • 13.60mm
  • 37.00mm


  • Sapphire

Water resistance

  • 60.00atm / 600.00m / 2000.00ft


  • Deployment Buckle
  • Metal


  • Metal


  • 2024

Official description

One of the greatest sources of inspiration when creating the DEFY Extreme Diver was the DEFY reference A3648. Originally launched in 1969, it presented an alternative take on ZENITH’s avant-garde and rugged steel bracelet watch with a specific purpose. The A3648 was not only among the earliest DEFY wristwatch models, but also one of the first DEFY diver’s watches. Even by today’s standards, the A3648 boasted incredible performance in a watch that seamlessly merges style and substance.

In ZENITH’s recent tradition of bringing back its most emblematic past references, the DEFY Revival A3648 represents the first time ever that a vintage ZENITH diver’s watch receives the Revival treatment.

A distinctive signature of the original DEFY line, the DEFY Revival A3648 features a highly angular stainless steel case measuring 37mm in diameter. The steel fourteen-sided bezel present in DEFY models from the same era is still present but positioned above the round rotating bezel. Crafted in steel, the unidirectional rotating bezel features a sapphire crystal insert instead of Plexiglas as in historical models, with the same black on bright orange markings – one of the historical A3648’s most coveted features.

The black and orange theme extends to the dial, where the matte black surface is contrasted with orange hands and minutes track. The hour markers as well as the hands are filled with white Super-LumiNova that emits a bright and long-lasting green glow.

With its screw-down crown at 4 o’clock and a sapphire display back, the DEFY Revival A3648 retains the same depth rating of 600 metres (60 ATM), a considerable feat to have achieved in 1969 and still an impressive rating for such a compact diver’s watch with a sapphire back. A symbolic number for ZENITH, as 600 metres is equal to 1’969 feet – the year the DEFY wristwatch line including the A3648 was launched. The case back offers a view of Elite 670 automatic manufacture movement, with a power reserve of 50 hours.

And just like the original, the DEFY Revival A3648 comes on a five-link steel bracelet with folding buckle, modelled after the bracelet the famed Gay Frères company had made for the historic reference in 1969. The deployant buckle features an expansion to allow the watch to be worn over a wetsuit without having to add or remove additional links.

The DEFY Revival A3648 is available from all ZENITH physical and online boutiques as well as authorized retailers around the world.