Seiko Cal. 6640 - 725

This Spring Drive model from 1970 features a 45mm Hardlex-Coated Steel case. It features a Blue Sunburst dial protected by a Mineral crystal and offers 120m of water resistance. [seikata-wm-0e7ebdd6f194]

Also known as: Shogun

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

45mm

Case Thickness

8.8mm

Lug Width

18mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Blue Sunburst

Jewels

31j

Frequency

36,000 bph

Power Reserve

42 hours

Year

1970

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