Seiko Cal. 5631 - 911

This Spring Drive model from 1989 features a 40mm Gold-Plated case. The Fixed bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-8e2b75190f65]

Also known as: Bellmatic, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

40mm

Case Thickness

13.5mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

150m

Dial Color

Cream

Jewels

29j

Frequency

36,000 bph

Power Reserve

36 hours

Year

1989

Related Models

• Seiko 7024-573
• Seiko 5241-405
• Seiko 4498-935
• Seiko 3834-356
• Seiko 4535-243
• Seiko 7035-434
• Seiko 6373-748
• Seiko 5682-780
• Seiko 6669-652
• Seiko 0728-376
• Seiko 0757-459
• Seiko 5659-295