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New mechanical diver’s watches inspired by abarnacle-covered 1977 Challenge Diver

CITIZEN PROMASTER captures the imagination of sports professionals around the world with highly functional sports watches. Two new mechanical diver’s watch models, inspired by the design of the 1977 Challenge Diver, will be released from the collection with upgraded specifications, including a movement with enhanced magnetic resistance.

CITIZEN’s archives contain a fascinating story about a lost Challenge Diver watch. In 1983, a Challenge Diver was found on Long Reef Beach in Australia. The watch was covered in barnacles after being submerged in the Pacific Ocean, but the movement inside had remained protected from the seawater and was still ticking. The number of barnacles attached to the watch hinted that it had been in the ocean for a number of years. These new models take design cues from the original Challenge Diver design, but their external features and the movement inside have been updated for contemporary use.

The sapphire glass has a flat cut top and a domed underside, and the sides of the glass are beveled to provide a chunky, retro look. The watches have a guardless crown design, and the 41.0 mm diameter (design specifications) is the same as the original model. The case is made of lightweight, scratch-resistant Super Titanium™, and is thinner than the original model to ensure a more comfortable fit on the wrist.

The Cal. 9051 movement in this model uses anti-magnetic materials for the balance spring and surrounding components to boost the magnetic resistance of the watch. It maintains its performance even when placed 1 centimeter from a device emitting a magnetic field. The watches are also resistant to magnetic fields from everyday devices, including smartphones, and they can even be used aboard ships with magnetic compasses. In addition to being resistant to magnetic fields, the watches are also ISO compliant* diver’s watches up to 200 meters. They can run for 42 hours when fully wound, with daily accuracy of -10 to +20 seconds.


A modern twist on the Challenge Diver design

– The same case diameter as the original model, but made with lightweight, scratch-resistant Super Titanium™. The case is thinner than the original, providing a more comfortable fit.

– Embossed indices and the classic green lume provide a vintage feel

– Rotating bezel is inset into the case The NB6021-17E model has a retro-look polyurethane band with a raised square pattern.

Mechanical diver’s watch with enhanced magnetic resistance

– Powered by a Cal. 9051 mechanical movement with enhanced magnetic resistance.

– ISO-compliant diver’s watch to 200m

– Up to 42 hours of running time when fully wound

– Average daily accuracy: -10 to +20 seconds


BrandCITIZEN PROMASTER / Mechanical Diver 200m
Launch2022 Summer
Case/BandSuper Titanium™(Duratect*³ TIC) / UrethaneSuper Titanium™(Duratect TIC)
GlassSapphire glass
Case diameter / thickness41.0mm / 12.3mm(design specification only )
SpecificationsCal.9051 Mechanical/ Automatic & Manual winding / Accuracy of average -10~+20sec/day */ Running time of approx. 42 hours (when fully wound)/ Frequency : 28,800 vph / 24 jewels / 200m water resistance