Seiko Cal. 6631 - 229

The 6631-229 is a sought-after Spring Drive piece from Seiko's golden era. The Bidirectional bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-66dfaa8546fb]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

40mm

Case Thickness

13.6mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

180m

Dial Color

Green

Jewels

22j

Frequency

28,800 bph

Power Reserve

64 hours

Year

1978

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