Seiko Cal. 5643 - 987

The Seiko 5643-987 represents an important milestone in Seiko's 1967 lineup. Powered by the 5643 caliber with 28j jewels beating at 21,600 bph, it delivers a 64 hours power reserve. [seikata-wm-905d1e66f6f9]

Also known as: Helmet, Crown

Specifications

Movement

Kinetic

Case Material

PVD Black

Case Width

41mm

Case Thickness

9.7mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

160m

Dial Color

Green

Jewels

28j

Frequency

21,600 bph

Power Reserve

64 hours

Year

1967

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