Seiko Cal. 5637 - 643

The 5637-643 is a sought-after Kinetic piece from Seiko's golden era. Powered by the 5637 caliber with 29j jewels beating at 36,000 bph, it delivers a 52 hours power reserve. [seikata-wm-a06f771bb992]

Also known as: Silverwave, World Timer

Specifications

Movement

Kinetic

Case Material

PVD Black

Case Width

35mm

Case Thickness

15.5mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

100m

Dial Color

Navy

Jewels

29j

Frequency

36,000 bph

Power Reserve

52 hours

Year

1977

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