Seiko Cal. 5664 - 637

This Automatic model from 1988 features a 39mm Hardlex-Coated Steel case. Powered by the 5664 caliber with 29j jewels beating at 21,600 bph, it delivers a 37 hours power reserve. [seikata-wm-b7cc63281c89]

Also known as: World Timer, Crown

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

11.6mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Champagne

Jewels

29j

Frequency

21,600 bph

Power Reserve

37 hours

Year

1988

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