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1. #WHAT DIAMETER IS THE CRYSTAL FOR A CITIZEN CALIBRE 8700 ISO#
2. #WHAT DIAMETER IS THE CRYSTAL FOR A CITIZEN CALIBRE 8700 PROFESSIONAL#
3. #WHAT DIAMETER IS THE CRYSTAL FOR A CITIZEN CALIBRE 8700 SERIES#

In the rare and discontinued Eco-Drive Duo series, the solar power was supplemented by an automatic quartz power source.

#WHAT DIAMETER IS THE CRYSTAL FOR A CITIZEN CALIBRE 8700 PROFESSIONAL#

Īmong the world’s ISO-certified watches for professional diving, the Fugu remains the mechanical watch in continuous production for the longest.Įco-Drive watches use a battery recharged by a solar panel hidden under the watch face. With a Miyota 8203 movement, Fugu automatic watches can be handwound – a significant advantage over their original competitor (Seiko's now discontinued SKX).

#WHAT DIAMETER IS THE CRYSTAL FOR A CITIZEN CALIBRE 8700 SERIES#

These issues were ultimately addressed by the NY011 series (launched in 2020). The original Fugu series (NY004, NY008 and NY009) were criticised for their bezel action and lack of sapphire crystal.

#WHAT DIAMETER IS THE CRYSTAL FOR A CITIZEN CALIBRE 8700 ISO#

All Fugu models are certified to the ISO 6425 standard for reliability underwater, resistance to shocks and magnetism, water-tightness and thermal-shock resistance. And in 1993, the Comando Raggruppamento Subacquei e Incursori Teseo Tesei adopted the Fugu NY004 for official use. Citizen eventually adopted Fugu as the watch's official name, even engraving some models' casebacks with a pufferfish logo. The watch's bezel has alternating smooth and serrated edges to provide a positive grip in wet conditions, with the shape inspired by the pufferfish. With its launch in 1989, fans nicknamed it the Fugu, after the Japanese pufferfish. īut it was perhaps the Fugu that became Citizen's most iconic diver. Also in 1982, Citizen launched the 1300m Professional Diver's watch – the world's most pressure-resistant wristwatch at the time. It became the forerunner to Citizen's range of dive watches, subsequently (1982) called the Promaster Marine range.

In 1959, Citizen launched the Parawater – Japan's first fully-waterproof wristwatch. The clasp, as with the Calibre 8700, is also used with leather bands as if they were metal bracelet-style watchbands however, when the clasp is fastened, the band appears to be a normal eye-hole and link pin leather watchband.ĭiving watches (including the Fugu) Ĭitizen Promaster Automatic NY0040-09EE diving watch The deployant clasp with a Push Button (DCP) is a clasp available for many Citizen watch bracelet bands.

Depending on the market, these watches may be labelled "Secret", "Lighthouse" brands among others. Contemporary watches Ĭitizen also produces the Independent Watches line, featuring a more modern, contemporary design than the traditional Citizen label. They are currently sold only in the Japanese domestic market but can be obtained internationally if ordered online. Chronomaster Īccurate to within five seconds per year, the Chronomaster line is unofficially the most accurate quartz-crystal watch ever made. In 2010, Miyota (Citizen Watch) of Japan introduced a newly developed movement (UHF 262 kHz) that uses a three-prong quartz crystal for the Precisionist or Accutron II line, a new type of quartz watch with ultra-high frequency (262.144 kHz) which is claimed to be accurate to +/− 10 seconds a year and has a smooth sweeping second hand rather than one that jumps each second. The Perpetual Chrono A-T synchronizes with the atomic clocks in Colorado or Germany, depending on signal strength and location, and incorporates Eco-Drive technology, so it does not require a battery. These features are comparable to the synchronization with atomic clocks found in Casio Wave Ceptor watches. The day, date, and daylight saving time settings are set automatically when the watch is synchronized. When traveling, the user may swap the 'home' and 'world' zones, thereby enabling proper time signal reception on a different continent while retaining the other time. The watch actually tracks two time zones-home and world-but synchronizes to the 'home' zone. The watches can synchronize with radio clocks in Japan, North America, and Europe, automatically selecting the correct frequency by location. The Skyhawk A-T line features radio-controlled timekeeping. Synchronized to atomic clocks, these watches are accurate to within one second in one hundred thousand years. Citizen Attesa Eco-Drive ATV53-3023 analog-digital chronograph with 3 area Radio Controlled reception (North America, Europe, Japan) Products Atomic timekeeping Ĭitizen launched the world's first multi-band atomic timekeeping watch in 1993 and has remained a pioneer of this field.