Seiko Cal. 6321 - 553

The Seiko 6321-553 represents an important milestone in Seiko's 1966 lineup. Powered by the 6321 caliber with 17j jewels beating at 28,800 bph, it delivers a 71 hours power reserve. [seikata-wm-d88f40e56a8e]

Also known as: Sumo, UFO

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

40mm

Case Thickness

9.1mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

200m

Dial Color

Black

Jewels

17j

Frequency

28,800 bph

Power Reserve

71 hours

Year

1966

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