Seiko Cal. 5638 - 764

The Seiko 5638-764 represents an important milestone in Seiko's 1969 lineup. It features a Black dial protected by a Mineral crystal and offers 90m of water resistance. [seikata-wm-041c4d0361b4]

Also known as: World Timer

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

44mm

Case Thickness

10.6mm

Lug Width

19mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

Black

Jewels

17j

Frequency

28,800 bph

Power Reserve

59 hours

Year

1969

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