Seiko Cal. 6637 - 593

The Seiko 6637-593 represents an important milestone in Seiko's 1978 lineup. The Coin-Edge bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-377a8901555f]

Also known as: Rally, Navigator

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

40mm

Case Thickness

9.4mm

Lug Width

19mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

90m

Dial Color

Cream

Jewels

20j

Frequency

28,800 bph

Power Reserve

53 hours

Year

1978

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