Seiko Cal. 6631 - 755

The Seiko 6631-755 represents an important milestone in Seiko's 1978 lineup. It features a Green dial protected by a Hardlex crystal and offers 140m of water resistance. [seikata-wm-a07b6601988d]

Also known as: Monster, Shogun

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

43mm

Case Thickness

11.9mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

140m

Dial Color

Green

Jewels

32j

Frequency

21,600 bph

Power Reserve

55 hours

Year

1978

Related Models

• Seiko 5632-124
• Seiko 6372-797
• Seiko 7083-114
• Seiko 5223-692
• Seiko 6370-297
• Seiko 7151-114
• Seiko 6136-499
• Seiko 4574-400
• Seiko 6226-807
• Seiko 6223-880
• Seiko 6257-371
• Seiko 7036-571