Seiko Cal. 6657 - 718

This Spring Drive model from 1978 features a 42mm PVD Black case. It features a Blue Sunburst dial protected by a Acrylic crystal and offers 80m of water resistance. [seikata-wm-60879143be0d]

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

42mm

Case Thickness

8.1mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

80m

Dial Color

Blue Sunburst

Jewels

17j

Frequency

28,800 bph

Power Reserve

37 hours

Year

1978

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