Seiko Cal. 4581 - 636

The 4581-636 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 4581 caliber with 28j jewels beating at 28,800 bph, it delivers a 53 hours power reserve. [seikata-wm-e1560a53f6e7]

Also known as: Shogun, Pogue

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

36mm

Case Thickness

12.6mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

170m

Dial Color

Blue Sunburst

Jewels

28j

Frequency

28,800 bph

Power Reserve

53 hours

Year

1970

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