Seiko Cal. 6690 - 744

This Automatic model from 1978 features a 46mm Hardlex-Coated Steel case. Powered by the 6690 caliber with 17j jewels beating at 21,600 bph, it delivers a 48 hours power reserve. [seikata-wm-d5cd05873a48]

Also known as: Sumo, Silverwave

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

46mm

Case Thickness

14.7mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

120m

Dial Color

Burgundy

Jewels

17j

Frequency

21,600 bph

Power Reserve

48 hours

Year

1978

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