Seiko Cal. 6635 - 790

Released in 1967, the Cal. 6635 with design code 790 was part of Seiko's domestic market collection. The Coin-Edge bezel and 39mm case give it a distinctive presence on the wrist. [seikata-wm-0751ecb665fb]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

39mm

Case Thickness

8.6mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

130m

Dial Color

Silver

Jewels

35j

Frequency

21,600 bph

Power Reserve

64 hours

Year

1967

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