Serviced Vintage 1965 JAPAN SEIKO SEIKOMATIC WEEKDATER 6206-8080 26J Automatic.

Serviced Vintage 1965 JAPAN SEIKO SEIKOMATIC WEEKDATER 6206-8080 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. : 5N33220.
• Dial No. : JAPAN 6206-8100TAD.
• Glass : Acrylic.
• Case size : About 37mm.
• Lug width : 19mm.
• Band : Wrist size that can be worn is Up to about 202mm.

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.
• Overhaul service in November 2026.
  The movement has been cleaned and oiled, so it works fine.

Key Features

• The Sovereign Apex of Mid-60s Business Executive Luxury (1965): Manufactured in 1965—a momentous historical year following the 1964 Tokyo Olympics that inaugurated Japan's golden era of mid-Showa industrial supremacy—the Seiko Seikomatic Weekdater reference 6206-8080 represented Suwa Seikosha's quintessential dual-calendar business flagship. Engineered to deliver chronometer-adjacent presence and everyday executive functionality, this reference stands as one of the most harmonious and refined expressions of mid-century Japanese dress watchmaking.
• The Over-Engineered 26-Jewel Caliber 6206 Automatic Heart: Powering this historic instrument is the revered 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 movement without provision for hand-winding, it incorporates Seiko's ultra-efficient Magic Lever bi-directional winding mechanism, proprietary Diashock anti-shock protection, an upgraded 26-jewel specification to minimize friction across the train, and an independent quick-set date calendar mechanism operated directly via the crown.
• Architectural ""8080"" Case and Recessed Crown Ergonomics: Executed in a solid stainless steel case, the reference 6206-8080 showcases classic mid-1960s dress geometry with gently tapering 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 6206-8080 is universally acclaimed 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 6206-8080 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

• Before buying.
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