Seiko Cal. 6639 - 638

The Seiko 6639-638 represents an important milestone in Seiko's 1980 lineup. It features a Silver dial protected by a Sapphire crystal and offers 110m of water resistance. [seikata-wm-9bb853da1b8e]

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

42mm

Case Thickness

12.3mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

110m

Dial Color

Silver

Jewels

34j

Frequency

28,800 bph

Power Reserve

60 hours

Year

1980

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