Seiko Cal. 6657 - 308

This Spring Drive model from 1973 features a 35mm Hardlex-Coated Steel case. It features a Champagne dial protected by a Mineral crystal and offers 180m of water resistance. [seikata-wm-0efd5ebd17d7]

Also known as: Monster, Pogue

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

35mm

Case Thickness

13.5mm

Lug Width

20mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

180m

Dial Color

Champagne

Jewels

17j

Frequency

28,800 bph

Power Reserve

67 hours

Year

1973

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