Seiko Cal. 5638 - 839

The 5638-839 is a sought-after Solar piece from Seiko's golden era. Powered by the 5638 caliber with 28j jewels beating at 28,800 bph, it delivers a 61 hours power reserve. [seikata-wm-65a6d6ed7c98]

Also known as: Tuna, Emperor

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

44mm

Case Thickness

13.9mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

140m

Dial Color

White

Jewels

28j

Frequency

28,800 bph

Power Reserve

61 hours

Year

1965

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