Seiko Cal. 6631 - 816

The Seiko 6631-816 represents an important milestone in Seiko's 1994 lineup. With its 21mm lug width and 15.1mm profile, it sits comfortably on most wrists. [seikata-wm-e6cc3c71ea7b]

Also known as: Monster, Golden Tuna

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

37mm

Case Thickness

15.1mm

Lug Width

21mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

200m

Dial Color

Champagne

Jewels

25j

Frequency

36,000 bph

Power Reserve

50 hours

Year

1994

Related Models

• Seiko 3832-647
• Seiko 6147-161
• Seiko 4484-451
• Seiko 6276-948
• Seiko 6282-560
• Seiko 4434-883
• Seiko 6673-247
• Seiko 6630-975
• Seiko 6693-299
• Seiko 3896-811
• Seiko 4595-225
• Seiko 5686-376