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A Seiko 5 showcasing attributes of the sub brand, including a recessed crown at the 4 o'clock position and day-date complication. Seiko 5 is a sub brand that spawned with the introduction of the Seiko Sportsmatic 5 in 1963. Since then, many models have been introduced into the lineup, comprising a variety of different styles.
Seiko, SII and Epson logos. Three companies share "Seiko" in their official names but have different corporate visual identities.. Seiko Group (セイコー・グループ, Seikō Gurūpu) was a Japanese corporate group consisting of three core companies Seiko Holdings Corp. (Seiko; f/k/a K. Hattori & Co., Hattori Seiko), Seiko Instruments Inc. (SII; f/k/a Daini Seikosha, Seiko Instruments ...
The Spring Drive uses a conventional mainspring [3] and barrel [4] along with automatic and/or stem winding to store energy, just as in a mechanical watch. [3] However, the escapement and balance wheel in mechanical watches is replaced by Seiko's Tri-synchro Regulator system, a phase-locked loop wherein a rotor, which Seiko refers to as a "glide wheel", is powered by the mainspring barrel via ...
5.35 25 28800 4 38 2000-1 [3] Mecaline Specialities automatic 19.4 3.6 20 28800 4 40 2681 [4] Mecaline automatic 19.4 4.8 25 28800 4 38 2094 [5] Mecaline Chronographes automatic 23.3 5.5 33 28800 4 37 7001 [6] Mecaline Specialities hand 23.3 2.5 17 21600 3 42 2801-2 [7] Mecaline hand 25.6 3.35 17 28800 4 42 2804-2 [8] Mecaline hand 25.6 3.35 17 ...
In 2019, Seiko released several limited edition Astron models to commemorate the 50th anniversary of the quartz Astron. [5] [6] Among them, the model produced in a limited edition of 50 pieces (3.8 million yen) mimics the original case design and has a rough engraving pattern by craftsmen belonging to Epson's "Micro Artist Workshop". [6]
To determine "longitude by chronometer," a navigator requires a chronometer set to the local time at the Prime Meridian. Local time at the Prime Meridian has historically been called Greenwich Mean Time (GMT), but now, due to international sensitivities, has been renamed as Coordinated Universal Time (UTC), and is known colloquially as "zulu time".
Using Seiko's own family of movements but with modern styling designed to appeal to younger customers, Alba watches are primarily aimed at Asian and Middle Eastern markets in the hope of creating long-term loyalty to the Seiko group as these customers' purchasing power increases. [3] The word 'Alba' translates to 'dawn' in Italian, and Spanish. [4]
Immersion of the watch in water under 125% of the rated pressure with a force of 5 N perpendicular to the crown and pusher buttons (if any) for 10 minutes. Immersion of the watch in 30 cm of water at the following temperatures for 5 minutes each, 40 °C, 5 °C and 40 °C again, with the transition between temperatures not to exceed 1 minute.