Offered in this auction by Second Vintage
This Seiko Seikomatic Weekdater is a significant piece of Japanese horological history, featuring the highly regarded 35-jewel movement that bridges the gap between standard Seiko automatics and the Grand Seiko line of the era. With its distinctive day display at the six o'clock position and robust stainless steel case featuring twisted lugs, this timepiece represents the peak of 1960s executive styling and engineering.
Brand: Seiko
Model: Seikomatic Weekdater
Reference Number: 6218-8971
Serial Number: 481838
Movement: Automatic Caliber 6218A
Dial: Silver sunburst with applied indices
Case Size: 37 mm (excluding the crown)
Case Material: Stainless Steel
Production Year: 1964
Condition: Good vintage condition, characterized by a beautifully preserved dial and honest wear to the case, running with a deviation of approximately -48s to -50s/day.
Dial and Hands
The watch features a sophisticated silver sunburst dial that remains in excellent condition for its age. It is adorned with polished, faceted applied baton indices and sharp dauphine hands that catch the light beautifully. The signature "Weekdater" layout presents a framed date window at the 3 o'clock position and a full "Saturday" day window positioned above the 6 o'clock marker, adding a balanced symmetry to the face. The script "Seikomatic" and "Diashock 35 Jewels" text is crisp and legible.
Case and Crystal
The 37mm stainless steel case offers a commanding presence on the wrist, distinguished by its thick, twisted "lyre" style lugs that are reminiscent of high-end Swiss designs of the same period. The case shows honest signs of vintage wear, including surface scratches and handling marks consistent with its age and history. The caseback displays the faint remnants of the iconic dolphin emblem and the specific reference markings.
Movement
Powering this timepiece is the highly respected Seiko Caliber 6218A automatic movement, featuring 35 jewels. This high-grade caliber is historically significant as it shares architecture with the first automatic Grand Seiko movements. Based on timegrapher testing, the movement is currently running at a rate of approximately -48 to -50 seconds per day, indicating it is functioning within acceptable vintage tolerances.
Strap
The watch is fitted with a brown leather strap featuring an alligator grain pattern and matching stitching, which complements the silver dial and adds a dressy, vintage aesthetic to the overall presentation.
Condition
This timepiece is in good vintage condition. While the case shows expected surface wear and scratches from decades of use, the dial has been preserved remarkably well, retaining a bright and clean appearance. The crystal is clear with minimal obstructions. The movement is running but showing a deviation of roughly -50 seconds per day as noted in the timegrapher results.
Dimensions
The case measures 37 mm in diameter excluding the crown, making it a modern-wearing vintage dress watch that fits comfortably on a variety of wrist sizes.
Remarks
The Seikomatic Weekdater is often cited by collectors as one of the best value propositions in vintage Seiko collecting due to its high-jewel count movement and "Grammar of Design" case elements. The fine adjuster on the balance bridge and the 35-jewel count are testaments to the high quality of the 6218 caliber. This specific example, with its clean dial and sharp case lines, is a wonderful representation of mid-century Japanese watchmaking.
History
Produced in August 1964, this watch hails from the golden era of Seiko's mechanical innovation. The Seikomatic line was positioned as the brand's premium automatic offering, incorporating advanced features like the Diashock shock protection system and the magic lever winding mechanism. This model specifically set the stage for the automatic Grand Seiko models that would follow shortly after.
/ Second Vintage
SKU: SEI-SWJ-0002
























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Seiko - Seikomatic Weekdater 銀輝 (Ginki) – Silver Radiance - No reserve price - 6218-8971 - Men - 1964
Seiko • 1964
Sold for
€292
Sold on Feb 22, 2026
38 bids105 watching
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