Seiko Cal. 6631 - 810

The Seiko 6631-810 represents an important milestone in Seiko's 1997 lineup. The Fixed bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-d60825bbb78f]

Also known as: Bullhead

Specifications

Movement

Automatic

Case Material

Gold-Plated

Case Width

37mm

Case Thickness

12.2mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

150m

Dial Color

Silver

Jewels

35j

Frequency

36,000 bph

Power Reserve

40 hours

Year

1997

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