Seiko Cal. 6639 - 791

This Quartz model from 1974 features a 44mm PVD Black case. It features a Navy dial protected by a Hardlex crystal and offers 90m of water resistance. [seikata-wm-00ecc461b197]

Also known as: Bullhead, Navigator

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

44mm

Case Thickness

13.8mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

90m

Dial Color

Navy

Jewels

23j

Frequency

36,000 bph

Power Reserve

51 hours

Year

1974

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