Seiko Cal. 6637 - 825

This Automatic model from 1965 features a 44mm Gold-Plated case. Powered by the 6637 caliber with 27j jewels beating at 28,800 bph, it delivers a 71 hours power reserve. [seikata-wm-0a1e320ed59b]

Also known as: Sumo, Navigator

Specifications

Movement

Automatic

Case Material

Gold-Plated

Case Width

44mm

Case Thickness

11.2mm

Lug Width

19mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

50m

Dial Color

Navy

Jewels

27j

Frequency

28,800 bph

Power Reserve

71 hours

Year

1965

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