An aquatic cricketIn 1961, Vulcain could boast of being the only watch Manufactures to offer a diver’s watch equipped with an aquatic alarm – in other words, an alarm that could also be heard underwater. Thanks to the ‘triple case back’ that acted as a resonance chamber, the Cricket Nautical reliably signaled when it was time to head back up. And it’s a performer on so many other levels, too. The purists among scuba diving enthusiasts, fans of mental arithmetic and no-stop tables, will be partial to its functional possibilities; lovers of vintage timepieces, on the other hand, will surely take to its particular aesthetic.More than a diving watch, a diving instrumentLike its forebear, the Cricket Nautical stands out with ample dimensions for its time, the diameter of 42mm making it easy to use the watch and read the dial indications underwater. Two superimposed dials – one fixed and the other rotating, adjustable with a dedicated crown at 4 o'clock – serve to determine decompression times. Depending on the dive duration and depth set on the dials, the rectangular aperture displays the stop times required at the typical depths of 9, 6 and 3 meters when ascending back to the surface after an extended underwater excursion.Watchaser Official Retailer2 Years International WarrantyWith box and papers Hands: Polished Silver Mechanical: Hand-wound alarm movement (12 lignes or 27.07mm in diameter), double barrel, equipped with the Exactomatic system, 165 components Indexes: White Super Luminova Case: 316L Steel Polished Silver Case-back: The ‘Triple Case Back’ acts as a resonance chamber, allowing the alarm function to be used underwater or in a sapphire crystal version embellished with the stylized Vulcain "V" Dial: Semi-matte black dial with decompression tables Diameter: 42 mm Triple Case-Back Thickness: 17.35 mm Crystal: Sapphire, domed, with anti-reflective coating (or domed plexiglass version) Water Resistance: 30 ATM (300 meters) Dimensions: 22x18 mm Buckle: 316L with engraved Vulcain logo Calibre: Cricket Alarm Calibre V10 Ringing time: 20 seconds +/- 5 seconds Functions: Hours, minutes, center seconds, alarm, decompression scale adjustable via screw-in crown at 4 o'clock Frequency: 18,000 vibrations / hour Power Reserve: 52 hours