Seiko Cal. 6631 - 200

The Seiko 6631-200 represents an important milestone in Seiko's 1965 lineup. The Rotating bezel and 44mm case give it a distinctive presence on the wrist. [seikata-wm-379135f297b8]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

44mm

Case Thickness

15.2mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

130m

Dial Color

Navy

Jewels

17j

Frequency

28,800 bph

Power Reserve

48 hours

Year

1965

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