Seiko Cal. 6638 - 431

The Seiko 6638-431 represents an important milestone in Seiko's 1994 lineup. It features a Black dial protected by a Acrylic crystal and offers 170m of water resistance. [seikata-wm-c13ae83fcf22]

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

43mm

Case Thickness

9.1mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

170m

Dial Color

Black

Jewels

34j

Frequency

36,000 bph

Power Reserve

57 hours

Year

1994

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