Seiko Cal. 5655 - 991

The Seiko 5655-991 represents an important milestone in Seiko's 1972 lineup. Powered by the 5655 caliber with 30j jewels beating at 36,000 bph, it delivers a 40 hours power reserve. [seikata-wm-929a8b83a8fa]

Also known as: Sumo, Bellmatic

Specifications

Movement

Automatic

Case Material

Gold-Plated

Case Width

44mm

Case Thickness

9.1mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

170m

Dial Color

White

Jewels

30j

Frequency

36,000 bph

Power Reserve

40 hours

Year

1972

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