Seiko Cal. 5631 - 666

This Hand-Winding model from 1971 features a 39mm Two-Tone case. With its 20mm lug width and 9.6mm profile, it sits comfortably on most wrists. [seikata-wm-ac23aa06027e]

Also known as: Silverwave

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

39mm

Case Thickness

9.6mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

110m

Dial Color

Green

Jewels

28j

Frequency

28,800 bph

Power Reserve

53 hours

Year

1971

Related Models

• Seiko 5249-961
• Seiko 7071-244
• Seiko 7154-441
• Seiko 5669-532
• Seiko 4492-240
• Seiko 6318-682
• Seiko 4533-988
• Seiko 6161-880
• Seiko 7076-709
• Seiko 3822-722
• Seiko 7129-556
• Seiko 6620-828