Seiko Cal. 6631 - 405

The Seiko 6631-405 represents an important milestone in Seiko's 1978 lineup. The Coin-Edge bezel and 42mm case give it a distinctive presence on the wrist. [seikata-wm-cbb6207994d4]

Also known as: World Timer

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

42mm

Case Thickness

11.8mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

40m

Dial Color

Silver

Jewels

24j

Frequency

21,600 bph

Power Reserve

65 hours

Year

1978

Related Models

• Seiko 5214-548
• Seiko 0766-400
• Seiko 6620-591
• Seiko 7147-458
• Seiko 6676-116
• Seiko 0784-387
• Seiko 5694-471
• Seiko 3831-340
• Seiko 5251-873
• Seiko 4496-128
• Seiko 6659-271
• Seiko 6661-826