Seiko Cal. 6657 - 766

This Spring Drive model from 1968 features a 45mm Two-Tone case. Powered by the 6657 caliber with 20j jewels beating at 36,000 bph, it delivers a 38 hours power reserve. [seikata-wm-08a24026850a]

Also known as: Turtle, Shogun

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

45mm

Case Thickness

12.7mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

130m

Dial Color

White

Jewels

20j

Frequency

36,000 bph

Power Reserve

38 hours

Year

1968

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