Seiko Cal. 5637 - 421

The 5637-421 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 5637 caliber with 31j jewels beating at 21,600 bph, it delivers a 68 hours power reserve. [seikata-wm-19b86193f808]

Also known as: Samurai, Arnie

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

37mm

Case Thickness

12.8mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

60m

Dial Color

Cream

Jewels

31j

Frequency

21,600 bph

Power Reserve

68 hours

Year

1968

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