Seiko Cal. 6644 - 578

This Automatic model from 1981 features a 35mm PVD Black case. The Fixed bezel and 35mm case give it a distinctive presence on the wrist. [seikata-wm-640c5beb56ed]

Also known as: Sumo, Bellmatic

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

35mm

Case Thickness

15.3mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

130m

Dial Color

Silver

Jewels

19j

Frequency

36,000 bph

Power Reserve

40 hours

Year

1981

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