Seiko Cal. 6657 - 391

This Spring Drive model from 1974 features a 45mm Gold-Plated case. Powered by the 6657 caliber with 29j jewels beating at 36,000 bph, it delivers a 60 hours power reserve. [seikata-wm-77c301db9cee]

Also known as: World Timer, Navigator

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

45mm

Case Thickness

9.0mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

180m

Dial Color

White

Jewels

29j

Frequency

36,000 bph

Power Reserve

60 hours

Year

1974

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