Seiko Cal. 6657 - 845

This Spring Drive model from 1973 features a 39mm PVD Black case. It features a Green dial protected by a Acrylic crystal and offers 80m of water resistance. [seikata-wm-3502466ff65c]

Also known as: Bullhead, World Timer

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

39mm

Case Thickness

15.4mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

80m

Dial Color

Green

Jewels

23j

Frequency

36,000 bph

Power Reserve

61 hours

Year

1973

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