Seiko Cal. 6658 - 637

Released in 1978, the Cal. 6658 with design code 637 was part of Seiko's domestic market collection. With its 22mm lug width and 9.9mm profile, it sits comfortably on most wrists. [seikata-wm-eb40bbe2e8e5]

Also known as: World Timer, Navigator

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

41mm

Case Thickness

9.9mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

100m

Dial Color

Champagne

Jewels

34j

Frequency

21,600 bph

Power Reserve

61 hours

Year

1978

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