Seiko Cal. 6631 - 976

The Seiko 6631-976 represents an important milestone in Seiko's 1968 lineup. It features a White dial protected by a Sapphire crystal and offers 200m of water resistance. [seikata-wm-034ad5859b7e]

Also known as: Tuna

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

45mm

Case Thickness

13.5mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

200m

Dial Color

White

Jewels

18j

Frequency

36,000 bph

Power Reserve

39 hours

Year

1968

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