Seiko Cal. 5631 - 413

The 5631-413 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 5631 caliber with 25j jewels beating at 28,800 bph, it delivers a 42 hours power reserve. [seikata-wm-0433f1c3433a]

Also known as: Sea Horse

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

36mm

Case Thickness

11.7mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

150m

Dial Color

Cream

Jewels

25j

Frequency

28,800 bph

Power Reserve

42 hours

Year

1986

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