Vintage 1965 JAPAN SEIKO SEIKOMATIC WEEKDATER 6218-8950 35Jewels Automatic.

Vintage 1965 JAPAN SEIKO SEIKOMATIC WEEKDATER 6218-8950 35Jewels Automatic.

Welcome to my auction!

Item description

Movement :

• Pet name : SEIKOMATIC WEEKDATER .
• Caliber No. : 6218A,B,C.
• Movement : Automatic.
• Beat rate : 18000.
• Year of manufacture start : 1964's.
• Factory : Suwa.

Externals :

• Serial No. : 5208207.
• Dial No. : JAPAN 6218-8950TAD.
• Glass : Acrylic.
• Case size : About 37mm.
• Lug width : 19mm.
• Band : New Leather Strap.

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 week : Iteration the hour hand at 9:00 to 1:00
• 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 Zenith of High-Jewel Automatic Luxury (1965): In 1965, the Seiko Seikomatic Weekdater carrying reference 6218-8950 stood as the absolute crown jewel of non-GS automatic horology in Japan. Produced by the Suwa Seikosha factory during a golden era of fierce industrial pride, this legendary timepiece was regulated to an elite, near-chronometer standard. It was engineered specifically to project power, prestige, and executive success for top-tier Japanese business leaders during the soaring mid-Showa economic boom.
• The Grand-Tier 35-Jewel Caliber 6218 Masterpiece: This watch is powered by the magnificent 35-jewel Caliber 6218 (specifically Cal. 6218A/B), a highly sophisticated automatic movement operating at 18,000 vibrations per hour (vph). In 1965, a 35-jewel count was a spectacular over-engineering statement, utilizing an incredible number of synthetic rubies to eliminate friction within the gear and calendar trains. Featuring a high-end tadpole micro-regulator (fine adjustment lever) and Seiko’s famous Magic Lever system, this caliber directly served as the mechanical architecture for the first-ever Automatic Grand Seiko (62GS).
• Architectural "8950" Muscular Executive Case Geometry: The reference 6218-8950 is celebrated globally for its commanding, heavy-set case presence. The stainless steel case features extraordinarily thick, broad lugs and an expansive bezel profile that perfectly previews Taro Tanaka's foundational "Grammar of Design." Complete with the signature crown entirely recessed at 4 o'clock to signal that manual winding was visually obsolete, this robust geometry maximized wrist presence while slipping perfectly under a tailored tailored sleeve.
• Flawless "Weekdater" Dial Purity and Symmetry: The dial of the 6218-8950 is a masterclass in mid-century clinical clarity, showcasing a radiant silver sunburst finish and hand-applied, multifaceted chunky block indices with black contrast tracks. The dual-calendar layout provides immense visual authority: a framed date aperture at 3 o'clock and a distinctively large, independent arched day window sitting proudly at 6 o'clock. This immaculate layout ensured split-second legibility for high-stakes corporate negotiation.
• The Sovereign Golden Lion Legacy: Produced in the historic milestone year of 1965, the 6218-8950 remains an absolute "holy grail" cornerstone for purist vintage Seiko collectors worldwide. It represents the crucial historical peak before Grand Seiko absorbed Seiko's ultimate automatic output. Most famously adorned with the prestigious solid gold Lion Medallion on the case back—the universal mid-century symbol reserved solely for Seiko's highest-grade luxury achievements—it stands as a profound testament to an era of uncompromised micro-engineering.

For more information, please look at the pictures.

Notes

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