Seiko Cal. 6640 - 531

This Automatic model from 1976 features a 38mm PVD Black case. It features a Navy dial protected by a Mineral crystal and offers 200m of water resistance. [seikata-wm-d6b0e4118d1e]

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

38mm

Case Thickness

10.5mm

Lug Width

22mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

200m

Dial Color

Navy

Jewels

24j

Frequency

21,600 bph

Power Reserve

46 hours

Year

1976

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