Seiko Cal. 6638 - 789

This Automatic model from 1981 features a 35mm Titanium case. Powered by the 6638 caliber with 24j jewels beating at 36,000 bph, it delivers a 63 hours power reserve. [seikata-wm-4399436c5213]

Also known as: Sumo, Arnie

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

35mm

Case Thickness

10.5mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

80m

Dial Color

Burgundy

Jewels

24j

Frequency

36,000 bph

Power Reserve

63 hours

Year

1981

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