Seiko Cal. 6663 - 635

The 6663-635 is a sought-after Automatic piece from Seiko's golden era. Powered by the 6663 caliber with 31j jewels beating at 36,000 bph, it delivers a 65 hours power reserve. [seikata-wm-cb430339a8e1]

Also known as: World Timer

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

34mm

Case Thickness

13.0mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

30m

Dial Color

Navy

Jewels

31j

Frequency

36,000 bph

Power Reserve

65 hours

Year

1986

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