Seiko Cal. 6638 - 665

This Automatic model from 1982 features a 41mm Hardlex-Coated Steel case. It features a Navy dial protected by a Acrylic crystal and offers 40m of water resistance. [seikata-wm-70924563ade0]

Also known as: Sumo, World Timer

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

41mm

Case Thickness

15.0mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

40m

Dial Color

Navy

Jewels

27j

Frequency

21,600 bph

Power Reserve

41 hours

Year

1982

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