Seiko Cal. 6331 - 920

This Automatic model from 1970 features a 38mm Stainless Steel case. It features a Blue Sunburst dial protected by a Sapphire crystal and offers 110m of water resistance. [seikata-wm-ca09fa7a8c56]

Also known as: World Timer, Baby Tuna

Specifications

Movement

Automatic

Case Material

Stainless Steel

Case Width

38mm

Case Thickness

12.2mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

110m

Dial Color

Blue Sunburst

Jewels

32j

Frequency

28,800 bph

Power Reserve

64 hours

Year

1970

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