Seiko Cal. 6639 - 763

This Spring Drive model from 1988 features a 38mm Two-Tone case. It features a Champagne dial protected by a Mineral crystal and offers 30m of water resistance. [seikata-wm-ee642d6041ae]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

38mm

Case Thickness

9.6mm

Lug Width

22mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

30m

Dial Color

Champagne

Jewels

28j

Frequency

28,800 bph

Power Reserve

72 hours

Year

1988

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