Seiko Cal. 5631 - 486

This Spring Drive model from 1987 features a 41mm PVD Black case. With its 20mm lug width and 12.2mm profile, it sits comfortably on most wrists. [seikata-wm-aa807a565de1]

Also known as: UFO

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

41mm

Case Thickness

12.2mm

Lug Width

20mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

170m

Dial Color

Silver

Jewels

20j

Frequency

28,800 bph

Power Reserve

66 hours

Year

1987

Related Models

• Seiko 5697-365
• Seiko 5696-558
• Seiko 3885-540
• Seiko 6386-290
• Seiko 4490-543
• Seiko 0731-219
• Seiko 4449-272
• Seiko 3848-927
• Seiko 4522-442
• Seiko 3890-542
• Seiko 4519-921
• Seiko 0768-590