Seiko Cal. 6644 - 937

This Automatic model from 1978 features a 45mm PVD Black case. It features a Blue Sunburst dial protected by a Acrylic crystal and offers 140m of water resistance. [seikata-wm-c8c587f09db5]

Also known as: Crown

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

45mm

Case Thickness

8.4mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

140m

Dial Color

Blue Sunburst

Jewels

31j

Frequency

28,800 bph

Power Reserve

40 hours

Year

1978

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