Seiko Cal. 6631 - 663

The Seiko 6631-663 represents an important milestone in Seiko's 1986 lineup. It features a Blue Sunburst dial protected by a Mineral crystal and offers 160m of water resistance. [seikata-wm-d94c67b8cacc]

Also known as: Bullhead, Crown

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

40mm

Case Thickness

11.7mm

Lug Width

21mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

160m

Dial Color

Blue Sunburst

Jewels

27j

Frequency

36,000 bph

Power Reserve

72 hours

Year

1986

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