Presented for auction by Second Vintage
This exceptional Seiko Seikomatic Weekdater encapsulates the golden era of Japanese watchmaking, offering a brilliant blend of elegant design and robust mechanical innovation. Known for its distinct full-word day display at the 6 o'clock position and a recessed crown that emphasizes its automatic winding capability, this piece stands as a highly collectible testament to Seiko's mid-century aesthetic and engineering prowess.
Brand: Seiko
Model: Seikomatic Weekdater
Reference Number: 6206-8990
Serial Number: 4300869
Movement: Automatic Caliber 6206A, 26 Jewels
Dial: Silver sunburst dial with applied faceted indices and day-date complications, showing a clean and attractive vintage appearance with minor even age
Case Size: 37 mm (excluding the crown)
Case Material: Stainless Steel
Production Year: 1964
Condition: Good vintage condition with honest wear and beautifully preserved mechanicals
Dial and Hands
The silver sunburst dial is a masterclass in mid-century layout, catching the light beautifully and providing a brilliant backdrop for the applied faceted rectangular indices, which feature a distinctive double baton at the 12 o'clock position. The dial is characterized by its framed date window at 3 o'clock and the signature full-word day aperture at 6 o'clock. The dial script, including the Seikomatic Weekdater text and the classic gyro logo, remains crisply printed. Close-up visual inspection reveals a generally clean surface with very faint, localized spotting consistent with age, maintaining a highly attractive overall presentation without any distracting damage. The sharp dauphine hands retain their original shape and feature aged luminous material that has transitioned to a soft green-yellow hue, perfectly complementing the vintage character of the watch.
Case and Crystal
The 37mm stainless steel case presents beautifully, featuring a classic round profile with sharp, faceted lugs that retain strong, well-defined lines. The recessed crown positioned at 4 o'clock maintains the sleek symmetry of the case, a deliberate design choice by Seiko to highlight the automatic nature of the movement. The smooth bezel transitions cleanly to the brushed and polished case flanks, showing honest, age-consistent handling marks and light wear. A domed acrylic crystal protects the dial, offering clear visibility with minor surface wear expected from a watch of this vintage. The snap-on caseback displays the iconic Seiko dolphin motif, which has softened from regular wear over the decades, alongside clearly legible serial and reference numbers.
Movement
Inside beats the impressive Seiko Caliber 6206A automatic movement, featuring 26 jewels. The close-up images reveal a striking gold-toned finish across the rotor and bridges, a mark of Seiko's higher-end offerings of the period. The movement components appear exceptionally clean and well-preserved, with crisp engravings denoting the caliber, jewel count, and Seiko branding. The visual condition of the movement is stunning, showcasing the enduring quality of Seiko's mid-century mechanical engineering.
Strap
The watch is fitted with a handsome black leather strap featuring a classic alligator grain pattern and a contrasting reddish-brown inner lining. It secures with a standard stainless steel pin buckle, perfectly complementing the dressy yet versatile nature of the timepiece.
Condition
The timepiece is presented in good vintage condition. The stainless steel case shows honest, age-consistent handling marks and light scratches but retains its structural integrity and sharp lug profiles. The dial is remarkably well-preserved with only minor signs of aging visible under magnification, free from heavy staining or moisture damage. The caseback engraving is present but exhibits softening from regular, careful wear over the decades. The internal gold-toned movement is visually immaculate, reflecting excellent preservation.
Dimensions
Case Size: 37 mm (excluding the crown).
Remarks
The Seikomatic Weekdater is celebrated for its balanced dial layout and reliable performance. The placement of the day window at 6 o'clock offers a unique visual symmetry that remains highly sought after by vintage Seiko enthusiasts, making this model a standout addition to any serious collection of Japanese horology.
History
Introduced in the early 1960s, the Seikomatic line represented Seiko's push into producing high-quality, reliable automatic watches for the discerning professional. The Weekdater models, with their innovative day and date displays, were particularly popular for their everyday utility and sophisticated styling. The caliber 6206 is renowned as a robust and beautifully finished movement, laying the groundwork for many of Seiko's most legendary automatic calibers of the late 20th century.
/ Second Vintage
SKU: SEI-SMW-0014






















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Seiko - Seikomatic Weekdater - No reserve price - 6206-8990 - Men - 1964
Seiko • 1964
Sold for
€421
Sold on May 3, 2026
35 bids51 watching
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