Seiko Cal. 6644 - 303

This Spring Drive model from 1974 features a 38mm Hardlex-Coated Steel case. The Rotating bezel and 38mm case give it a distinctive presence on the wrist. [seikata-wm-f7cbd5a5b7bd]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

9.8mm

Lug Width

20mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

80m

Dial Color

Green

Jewels

30j

Frequency

28,800 bph

Power Reserve

45 hours

Year

1974

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