Seiko Cal. 5639 - 188

The Seiko 5639-188 represents an important milestone in Seiko's 1971 lineup. It features a White dial protected by a Mineral crystal and offers 90m of water resistance. [seikata-wm-d9ebedef5e40]

Also known as: World Timer, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

46mm

Case Thickness

15.2mm

Lug Width

22mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

White

Jewels

26j

Frequency

28,800 bph

Power Reserve

52 hours

Year

1971

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