Seiko Cal. 6630 - 956

The 6630-956 is a sought-after Automatic piece from Seiko's golden era. Powered by the 6630 caliber with 36j jewels beating at 21,600 bph, it delivers a 49 hours power reserve. [seikata-wm-8889d2668ace]

Also known as: Sumo, World Timer

Specifications

Movement

Automatic

Case Material

Stainless Steel

Case Width

44mm

Case Thickness

11.4mm

Lug Width

22mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

100m

Dial Color

Blue Sunburst

Jewels

36j

Frequency

21,600 bph

Power Reserve

49 hours

Year

1977

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