Seiko Cal. 6631 - 373

The Seiko 6631-373 represents an important milestone in Seiko's 1984 lineup. The Inner Rotating bezel and 35mm case give it a distinctive presence on the wrist. [seikata-wm-ef41095ff56b]

Also known as: Baby Tuna

Specifications

Movement

Quartz

Case Material

Stainless Steel

Case Width

35mm

Case Thickness

15.3mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

110m

Dial Color

Blue Sunburst

Jewels

17j

Frequency

28,800 bph

Power Reserve

71 hours

Year

1984

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