Seiko Cal. 6331 - 620

The 6331-620 is a sought-after Spring Drive piece from Seiko's golden era. It features a Blue Sunburst dial protected by a Hardlex crystal and offers 190m of water resistance. [seikata-wm-7f86b01ad899]

Also known as: Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

45mm

Case Thickness

10.2mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

190m

Dial Color

Blue Sunburst

Jewels

28j

Frequency

21,600 bph

Power Reserve

70 hours

Year

1997

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