Seiko Cal. 6639 - 305

The Seiko 6639-305 represents an important milestone in Seiko's 1988 lineup. It features a White dial protected by a Hardlex crystal and offers 40m of water resistance. [seikata-wm-669be5d0da77]

Also known as: Golden Tuna

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

43mm

Case Thickness

14.4mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

40m

Dial Color

White

Jewels

36j

Frequency

21,600 bph

Power Reserve

58 hours

Year

1988

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