Seiko Cal. 6644 - 326

This Quartz model from 1965 features a 37mm Hardlex-Coated Steel case. Powered by the 6644 caliber with 24j jewels beating at 36,000 bph, it delivers a 42 hours power reserve. [seikata-wm-f126cf8604d6]

Also known as: Sumo

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

11.7mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

180m

Dial Color

White

Jewels

24j

Frequency

36,000 bph

Power Reserve

42 hours

Year

1965

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