Japanese watchmaker Seiko has just unveiled a new iteration of the world's first quartz-powered diver's watch, the 1978 Professional Diver's 600m, which upgraded the original titanium-encased model from 1975 with a 7549 caliber movement.

The OG timepiece was the result of a request from a Hiroshima diver who complained that no watch could survive his plunges of up to 300 meters. When tested in 1983, the Professional Diver's 600m survived a dive to 1,062 meters below sea level after being strapped to a submarine, well over the 600 meters indicated by the name.

This updated model upgrades both the tech and design with modern elements, with its 1,000-meter water resistance now etched on the watch face. The caliber has been changed to a 7C46 to complement other enhancements, such as a zirconia ceramic outer protection case (replacing the original titanium), LumiBrite-coated indicators, and a high-strength silicone strap. The watch's luxe black and matte gold finish is a recreation of the original.

Only 1,978 units of the timepiece have been made and it's expected to drop this September. Head over to Seiko for more information.

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