Vintage Seiko 5 Actus SS watch 6106-8670 Blue dial 1974

SPECIFICATION

Reference: Seiko 5 Actus 6106-8670
Movement: automatic calibre 6106 25 Jewels
Age: September 1974
Case Size: 37mm
Case Thickness: 11mm
Lug to Lug: 41mm
Lugs: 18mm
Condition: used Seiko watch
Box & Papers: No
Case Material: Stainless Steel
Warranty: 12-Months Warranty

POINTS TO MENTION

• In great pre-owned condition, with some wear
  
• Case and bezel have some light marks and scratches
  
• Stunning blue sunburst dial
  
• Fully serviced automatic movement
  
• Day wheel in English and Kanji
  
• Paired with an unworn blue leather strap

The Seiko 6106 is a robust automatic movement produced from the late 1960s through the 1970s It runs at 21,600 beats and features 25 jewels. The movement includes Seiko’s efficient Magic Lever winding system, quick-set day and date functions, and, in later variants like this one (6106B and 6106C), a hacking seconds feature for precise time setting.

A BIT OF TRIVIA

The Seiko Actus line, often branded as Seiko 5 Actus, was produced primarily in the early to mid-1970s and sold mainly within Japan. It was designed as a youthful, design-forward alternative to Seiko’s more conservative lines — sitting between everyday Seiko automatics and the higher-end King and Grand Seiko ranges. The Actus series used reliable workhorse movements such as the 6106, 7019, and 7009 calibres, offering automatic winding, day/date functions, and in some cases hacking seconds — features that were advanced for their price point at the time. When you see “Seiko 5 Actus SS” on a dial, it indicates that the watch is part of the Actus line and fitted with a hacking version of the 6106 movement (specifically the 6106B or 6106C calibre). Non-SS models used non-hacking variants like the 6106A

Design was a major focus for Actus models. They reflect the bold, experimental spirit of 1970s watchmaking with faceted crystals, angular cases, and vibrant dials in sunburst blue, emerald green, gold, and fumé tones. Case sizes are typically around 37–38 mm, giving them a comfortable, versatile wear. While they were never positioned as luxury watches, their build quality and mechanical reliability made them durable, dependable pieces — qualities that collectors still appreciate today.

Because most Actus watches were Japan-domestic-market releases, they remain relatively uncommon outside Japan. This exclusivity, coupled with their distinct vintage styling and Seiko’s growing collector base, has made them increasingly desirable among enthusiasts seeking affordable mechanical watches with character.

OUR THOUGHTS

The Seiko Actus is an excellent choice for anyone seeking an authentic, affordable vintage watch with real character. Produced in the 1970s for the Japanese domestic market, it combines Seiko’s renowned mechanical reliability with bold, distinctive design. Well-built, stylish, and often overlooked, the Actus delivers genuine vintage charm and everyday wearability without the high price tag — making it a standout value in the world of classic mechanical watches.