Seiko Cal. 5639 - 631

The 5639-631 is a sought-after Quartz piece from Seiko's golden era. Powered by the 5639 caliber with 26j jewels beating at 28,800 bph, it delivers a 56 hours power reserve. [seikata-wm-3686c84458a0]

Also known as: Goldfeather, Baby Tuna

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

11.3mm

Lug Width

18mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

120m

Dial Color

Navy

Jewels

26j

Frequency

28,800 bph

Power Reserve

56 hours

Year

1984

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