Seiko Cal. 6638 - 334

The Seiko 6638-334 represents an important milestone in Seiko's 1978 lineup. The Bidirectional bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-431102cd4bd4]

Also known as: UFO, World Timer

Specifications

Movement

Kinetic

Case Material

Titanium

Case Width

40mm

Case Thickness

15.2mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

130m

Dial Color

Green

Jewels

34j

Frequency

36,000 bph

Power Reserve

51 hours

Year

1978

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