Seiko 5 Actus SS 6106-8660 – September 1974 – Green Sunburst – 25 Jewels – JDM Vintage – serviced

The Seiko 5 Actus represents the sportier, more modern iteration of Seiko's mechanical line from the 1970s. This particular example, reference 6106-8660, dates from September 1974 (serial number 49xxxx) and embodies the transition from classic dress aesthetics to the bolder designs of the mid-70s.

Historical Context

Within Seiko's product architecture, the Seiko 5 Actus was positioned as follows:

• technically above the classic Seiko 5 models
• below Lord Matic, King Seiko, and Grand Seiko
• with a focus on modern design and everyday usability

Actus models were primarily designed for the Japanese Domestic Market (JDM) and often feature bolder dial colors and case shapes.

Design

Special highlights of this example:

• intense green sunburst dial with strong light dynamics
• applied, polished indices
• clean, minimalist hands
• bilingual Day-Date display (Kanji / English)
• sporty integrated case shape typical of the 1970s

The green variant, in particular, is significantly rarer today than classic silver or black models.

Technology

• Caliber: Seiko 6106 (Automatic)
• 25 Jewels
• Day-Date with quickset
• robust, everyday construction
• Production: early to mid-1970s

The 6106 is one of the most reliable Seiko automatic movements of its time and was used in numerous JDM models.

Condition

• very nice, original condition
• particularly well-preserved dial with vibrant color
• case with light, age-appropriate signs of wear
• clear crystal
• professionally serviced in Japan (Autumn 2025)
• technically flawless

Strap

• high-quality, period-correct aftermarket steel bracelet by the Japanese brand Maruman
• visually and stylistically very fitting for the watch
• high wearing comfort

Technical Specifications

• Reference: 6106-8660
• Production Date: September 1974
• Movement: Seiko 6106 Automatic
• Diameter: 37 mm (without crown)
• Lug-to-Lug: 41.4 mm
• Height: 10.4 mm
• Lug Width: 19 mm
• Weight: 76 g
• Case: Stainless Steel

Collector's Assessment

This watch is particularly interesting because it:

• offers a rare dial color (Green Sunburst)
• comes from the design-strong phase of the mid-1970s
• uses a solid and proven automatic movement
• has already been serviced in Japan

This makes it a very attractive overall package, both visually and technically, within the vintage Seiko segment.

Warranty (used)

This is a used item. The limitation period for defect claims (statutory warranty) is 12 months from delivery.

Note

As this is a used watch, no water resistance can be guaranteed. To protect the movement, the watch should not come into contact with water or moisture.