Seiko Cal. 6643 - 709

This Spring Drive model from 1972 features a 38mm PVD Black case. The Bidirectional bezel and 38mm case give it a distinctive presence on the wrist. [seikata-wm-deafb286df16]

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

38mm

Case Thickness

11.1mm

Lug Width

21mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

90m

Dial Color

Burgundy

Jewels

30j

Frequency

28,800 bph

Power Reserve

56 hours

Year

1972

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