Seiko Cal. 6638 - 420

The 6638-420 is a sought-after Kinetic piece from Seiko's golden era. The Bidirectional bezel and 43mm case give it a distinctive presence on the wrist. [seikata-wm-8836e9fb06af]

Also known as: Sumo, Panda

Specifications

Movement

Kinetic

Case Material

Titanium

Case Width

43mm

Case Thickness

8.0mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

200m

Dial Color

Blue Sunburst

Jewels

33j

Frequency

21,600 bph

Power Reserve

65 hours

Year

1990

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