Seiko Seikomatic Weekdater 6206-8010 – Vintage Automatic 1965 (January 1965)

Classic Japanese automatic watch with caliber 6206A – manufactured in January 1965

This Seiko Seikomatic Weekdater Ref. 6206-8010AD is an elegant example of Japanese watchmaking from the 1960s – manufactured in January 1965 (serial number 51xxxxx).
It belongs to the early Seikomatic series , which is considered the predecessor line of the later Seiko Lord Matic and Presmatic models and is known for its exceptional build quality and precision.

At its heart is the tried-and-tested Seiko caliber 6206A with 26 jewels and Diashock shock protection – a robust automatic movement with manual winding and quick-set date. It displays the day of the week and date in separate windows at 3 and 9 o'clock, with a switchable English or Japanese display.

The silver sunburst dial with applied indices, faceted hands and the classic “Seikomatic” lettering gives the watch a clear, harmonious look that is typical of Seiko’s mid-century design.

The newly fitted original Seiko leather strap made of lizard leather completes the authentic look.

⚙️ Technical specifications

• Brand: Seiko
• Series: Seikomatic Weekdater
• Reference: 6206-8010AD
• Caliber: Seiko 6206A (automatic, 26 jewels, Diashock)
• Date of manufacture: January 1965
• Accuracy (factory setting): approx. ±30 sec./day
• Housing material: Stainless steel
• Diameter: 35.7 mm (excluding crown)
• Height: 12.2 mm
• Lug-to-lug: 40.2 mm
• Lug width: 18 mm
• Weight: 47 g (including new leather strap)
• Dial: Silver, sunburst finish, applied indices
• Hands: Polished stainless steel
• Glass: Acrylic glass
• Strap: New original Seiko leather strap (lizard leather, brown, ¥6,600 list price)
• Water resistance: Originally splash-proof (not tested)

⏱️ Features

• Automatic winding with manual winding
• Second stop
• Date and day of the week display (bilingual: English/Japanese)
• Diashock shock protection
• 26 bearing stones

🌏 Special features

• Original JDM model (Japan Domestic Market)
• Production January 1965
• Seiko 6206A movement – direct predecessor of the 6218 caliber
• Very good condition for its age, technically fully functional
• Original dial , authentically aged with a light patina
• Original crown and movement unchanged
• New original Seiko leather strap (lizard, made in Japan)
• Typical mid-century design with classic lines

🏛️ Background

The Seikomatic Weekdater series was produced between 1963 and 1967 and was part of Seiko's rise to international top class.
The Caliber 6206A is considered one of the most precise automatic movements of its time and formed the technical basis for later Grand Seiko developments.

The models in this series are now sought-after vintage watches , especially in original, unpolished condition. They embody the elegance of the 1960s with the reliability that has made Seiko famous.

Condition: Very good for its age, fully functional, slight signs of wear on the case, clean dial with homogeneous patina.

Warranty (used)
This is a used item. The limitation period for claims based on defects (statutory warranty) is 12 months from delivery.

Notice
As this is a pre-owned watch, water resistance cannot be guaranteed. To protect the movement, the watch should not come into contact with water or moisture.