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In 1982, the brand introduced the quartz-powered Professional Diver 1300m (which briefly was the dive watch with the highest depth rating). Citizen had opted for an “ultra-airtight” titanium case with four visible screws near the lugs to address the needs of saturation divers, and the knurled crown was located at 9 o’clock to further increase safety.
According to Citizen, the “Professional 1300m […] with a tough four-sided bezel shroud around its thick and strong titanium case, was made in such a way that a Helium escape valve was not necessary.” When it was first introduced, the watch came at a relatively high price of 180,000 yen and was consequently produced in low numbers (plus it was aimed at the small number of professionals who would need such a watch with exceptional water resistance). Two years later, in 1984, slightly less radical 800-meter versions were added to the collection, further establishing the rather industrial-looking design with titanium case, knurled crown and a tall, rotating bezel with trapezoid elements.
https://www.watchtime.com/featured/kaid ... iver-200m/
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