Seiko Cal. 6663 - 526

The 6663-526 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 40 hours power reserve. [seikata-wm-1e831765a42e]

Also known as: Sumo

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

34mm

Case Thickness

14.7mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

80m

Dial Color

Cream

Jewels

31j

Frequency

36,000 bph

Power Reserve

40 hours

Year

1984

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