Seiko Cal. 6631 - 909

The Seiko 6631-909 represents an important milestone in Seiko's 1975 lineup. It features a Black dial protected by a Sapphire crystal and offers 110m of water resistance. [seikata-wm-b119d05c3d8b]

Also known as: Bellmatic

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

35mm

Case Thickness

9.1mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

110m

Dial Color

Black

Jewels

34j

Frequency

36,000 bph

Power Reserve

54 hours

Year

1975

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