Seiko Cal. 6638 - 696

The Seiko 6638-696 represents an important milestone in Seiko's 1988 lineup. Powered by the 6638 caliber with 22j jewels beating at 36,000 bph, it delivers a 63 hours power reserve. [seikata-wm-2573291dd860]

Also known as: Sumo, World Timer

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

43mm

Case Thickness

15.7mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

70m

Dial Color

Champagne

Jewels

22j

Frequency

36,000 bph

Power Reserve

63 hours

Year

1988

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