Seiko Cal. 5631 - 392

This Hand-Winding model from 1988 features a 44mm Two-Tone case. Powered by the 5631 caliber with 26j jewels beating at 28,800 bph, it delivers a 51 hours power reserve. [seikata-wm-0664ead6a6cf]

Also known as: Monster, Flighty

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

44mm

Case Thickness

11.6mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

100m

Dial Color

Blue Sunburst

Jewels

26j

Frequency

28,800 bph

Power Reserve

51 hours

Year

1988

Related Models

• Seiko 4575-497
• Seiko 6180-497
• Seiko 3866-834
• Seiko 7081-238
• Seiko 7087-260
• Seiko 6382-814
• Seiko 4479-174
• Seiko 5613-555
• Seiko 6122-845
• Seiko 6360-627
• Seiko 7183-218
• Seiko 4494-191