Seiko Cal. 5631 - 861

The Seiko 5631-861 represents an important milestone in Seiko's 1991 lineup. With its 21mm lug width and 12.7mm profile, it sits comfortably on most wrists. [seikata-wm-4db4c6277a72]

Also known as: UFO

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

12.7mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

150m

Dial Color

Black

Jewels

25j

Frequency

21,600 bph

Power Reserve

72 hours

Year

1991

Related Models

• Seiko 6372-656
• Seiko 6217-645
• Seiko 5616-505
• Seiko 7010-201
• Seiko 6188-453
• Seiko 3898-902
• Seiko 7014-306
• Seiko 6123-220
• Seiko 6394-953
• Seiko 6235-327
• Seiko 6645-190
• Seiko 7066-923