Seiko Cal. 5231 - 639

The Seiko 5231-639 represents an important milestone in Seiko's 1966 lineup. Powered by the 5231 caliber with 20j jewels beating at 21,600 bph, it delivers a 42 hours power reserve. [seikata-wm-0eba518f6b92]

Also known as: Tuna, Pogue

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

46mm

Case Thickness

9.2mm

Lug Width

22mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

60m

Dial Color

Cream

Jewels

20j

Frequency

21,600 bph

Power Reserve

42 hours

Year

1966

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