Seiko Cal. 4539 - 486

This Spring Drive model from 1981 features a 40mm Stainless Steel case. Powered by the 4539 caliber with 32j jewels beating at 28,800 bph, it delivers a 66 hours power reserve. [seikata-wm-a520a754f34f]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

40mm

Case Thickness

9.8mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

110m

Dial Color

Green

Jewels

32j

Frequency

28,800 bph

Power Reserve

66 hours

Year

1981

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