Seiko Cal. 6231 - 963

The 6231-963 is a sought-after Spring Drive piece from Seiko's golden era. The Fixed bezel and 35mm case give it a distinctive presence on the wrist. [seikata-wm-43bad19dbba1]

Also known as: Helmet, Navigator

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

35mm

Case Thickness

11.8mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

150m

Dial Color

Green

Jewels

33j

Frequency

21,600 bph

Power Reserve

55 hours

Year

1971

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