Seiko Cal. 6657 - 680

This Automatic model from 1966 features a 36mm Hardlex-Coated Steel case. It features a Black dial protected by a Acrylic crystal and offers 60m of water resistance. [seikata-wm-426d360dca9e]

Also known as: World Timer, Baby Tuna

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

14.6mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

60m

Dial Color

Black

Jewels

17j

Frequency

28,800 bph

Power Reserve

45 hours

Year

1966

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