Seiko Cal. 5638 - 331

The Seiko 5638-331 represents an important milestone in Seiko's 1971 lineup. Powered by the 5638 caliber with 30j jewels beating at 28,800 bph, it delivers a 43 hours power reserve. [seikata-wm-fcbd1265089a]

Also known as: Turtle, Sea Horse

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

43mm

Case Thickness

15.6mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

190m

Dial Color

White

Jewels

30j

Frequency

28,800 bph

Power Reserve

43 hours

Year

1971

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