Seiko Cal. 6637 - 790

Released in 1988, the Cal. 6637 with design code 790 was part of Seiko's domestic market collection. The Bidirectional bezel and 34mm case give it a distinctive presence on the wrist. [seikata-wm-ec155ecb3b09]

Also known as: Bullhead, Rally

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

34mm

Case Thickness

11.2mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

190m

Dial Color

Navy

Jewels

33j

Frequency

28,800 bph

Power Reserve

52 hours

Year

1988

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