Seiko Cal. 5631 - 766

The Seiko 5631-766 represents an important milestone in Seiko's 1975 lineup. With its 20mm lug width and 15.6mm profile, it sits comfortably on most wrists. [seikata-wm-0903a0499456]

Also known as: Emperor

Specifications

Movement

Solar

Case Material

Titanium

Case Width

39mm

Case Thickness

15.6mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

160m

Dial Color

Green

Jewels

32j

Frequency

28,800 bph

Power Reserve

72 hours

Year

1975

Related Models

• Seiko 6338-924
• Seiko 4496-497
• Seiko 6298-554
• Seiko 3850-817
• Seiko 6254-310
• Seiko 6337-121
• Seiko 6124-696
• Seiko 4453-453
• Seiko 6172-860
• Seiko 5219-439
• Seiko 5295-389
• Seiko 5635-558