Seiko Cal. 5638 - 993

The Seiko 5638-993 represents an important milestone in Seiko's 1980 lineup. It features a Black dial protected by a Sapphire crystal and offers 170m of water resistance. [seikata-wm-a3fbd0bfd9c2]

Also known as: World Timer

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

12.0mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

170m

Dial Color

Black

Jewels

20j

Frequency

21,600 bph

Power Reserve

57 hours

Year

1980

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