Seiko Cal. 6698 - 631

The 6698-631 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6698 caliber with 25j jewels beating at 36,000 bph, it delivers a 37 hours power reserve. [seikata-wm-3f2559680f7c]

Also known as: Sumo, Rally

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

34mm

Case Thickness

15.4mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

70m

Dial Color

Green

Jewels

25j

Frequency

36,000 bph

Power Reserve

37 hours

Year

1970

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