Seiko Cal. 5650 - 644

The Seiko 5650-644 represents an important milestone in Seiko's 1979 lineup. Powered by the 5650 caliber with 22j jewels beating at 21,600 bph, it delivers a 66 hours power reserve. [seikata-wm-9306210c7e9a]

Also known as: Sumo, World Timer

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

38mm

Case Thickness

11.3mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

100m

Dial Color

White

Jewels

22j

Frequency

21,600 bph

Power Reserve

66 hours

Year

1979

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