Seiko Cal. 6687 - 431

The Seiko 6687-431 represents an important milestone in Seiko's 1969 lineup. With its 21mm lug width and 11.1mm profile, it sits comfortably on most wrists. [seikata-wm-e14ae5a41b74]

Also known as: UFO, Silverwave

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

11.1mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

150m

Dial Color

Blue Sunburst

Jewels

35j

Frequency

28,800 bph

Power Reserve

48 hours

Year

1969

Related Models

• Seiko 5626-753
• Seiko 0757-660
• Seiko 6374-636
• Seiko 7073-752
• Seiko 7159-511
• Seiko 6294-261
• Seiko 0737-763
• Seiko 4467-979
• Seiko 7096-913
• Seiko 6612-873
• Seiko 3836-546
• Seiko 6354-590