Vintage 1965 JAPAN SEIKO SEIKOMATIC WEEKDATER 6206-8040 26Jewels Automatic.

Vintage 1965 JAPAN SEIKO SEIKOMATIC WEEKDATER 6206-8040 26Jewels Automatic.

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Item description

Movement :

• Pet name : SEIKOMATIC WEEKDATER .
• Caliber number : 6206A,B.
• Movement : Automatic.
• Beat rate : 18000bph.
• Year of manufacture start : 1963's.
• Factory : Suwa.

Externals :

• Serial No. : 5N05933.
• Dial No. : JAPAN 6206-8040T AD.
• Glass : Acrylic.
• Case size : About 36.1mm.
• Lug width : 19mm.
• Band : Wrist size that can be worn is Up to about 190mm.

Condition :

• Used, it runs well.
• Quick set(Day/Date) : Okay.
  Set the day of the week : English only.
  Set of the date : The set at one stage pulling the crown.
  Set of the days of the week : Iteration the hour hand at 9:00 and 12:00
• The day difference time of an used watch is about +-1 minute / day.
• For practical, everyday use, it would be advisable to have the movement cleaned and oiled.

Key Features

• The Sovereign Peak of Mid-60s Executive Weekdater Luxury (1965): Manufactured in 1965—a momentous historical year following the 1964 Tokyo Olympics that signaled Japan's golden era of mid-Showa industrial ascendancy—the Seiko Seikomatic Weekdater reference 6206-8040 stood as Suwa Seikosha's quintessential business-class flagship. Engineered to bring chronometer-grade presence and dual-calendar executive capability to Japan's rising corporate leadership, this reference remains one of the most balanced expressions of mid-century Japanese dress watchmaking.
• The Over-Engineered 26-Jewel Caliber 6206 Automatic Heart: Powering this historic watch is the celebrated 26-jewel Caliber 6206 (6206B), an in-house automatic engine operating at a steady frequency of 18,000 vibrations per hour (vph). Designed exclusively as a dedicated self-winding caliber, it utilizes Seiko's ultra-efficient Magic Lever bi-directional winding mechanism, proprietary Diashock anti-shock protection, an upgraded 26-jewel specification to minimize gear-train friction, and a convenient quick-set date calendar mechanism operated via the crown.
• Architectural ""8040"" Case and Recessed Crown Ergonomics: Executed in a solid stainless steel case, the reference 6206-8040 showcases classic mid-1960s dress geometry with sweeping tapered lugs, smooth mirror-polished bezel planes, and subtle chamfered edges. In signature Seikomatic style, the case completely conceals a flush-recessed crown at 4 o'clock, establishing a perfectly symmetrical circular silhouette that rests completely flat against the wrist and slides effortlessly under a tailored shirt cuff.
• Masterful Dual-Calendar Dial Harmony and Arched Day Window: The dial of the 6206-8040 is universally admired for its immaculate Showa-era layout symmetry, featuring a radiant silver sunburst canvas framed by a finely grooved outer minute track. It is adorned with hand-applied, multifaceted rectangular block indices, crisp dauphine hands, a framed quick-set date aperture at 3 o'clock, and the iconic arched full day-of-the-week window positioned at 6 o'clock, proudly signed with vintage cursive ""Seikomatic"" script and the ""DIASHOCK 26 JEWELS"" designation above Suwa's swirl emblem.
• The Sovereign Dolphin Case Back Medallion Heritage: Embellishing the backplate of this 1965 vintage treasure is Seiko's iconic embossed Dolphin crest (or deeply stamped waterproof dolphin medallion). Certifying its factory-tested waterproof construction and executive sports-dress heritage, the 6206-8040 26-jewel Seikomatic Weekdater remains an indispensable, highly accessible cornerstone reference for serious vintage Seiko collectors worldwide.

For more information, please look at the pictures.

Notes

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