Seiko Cal. 6331 - 406

The Seiko 6331-406 represents an important milestone in Seiko's 1969 lineup. It features a Black dial protected by a Acrylic crystal and offers 120m of water resistance. [seikata-wm-40216342b42e]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

38mm

Case Thickness

10.7mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

120m

Dial Color

Black

Jewels

17j

Frequency

28,800 bph

Power Reserve

49 hours

Year

1969

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