Seiko Cal. 0721 - 553

The Seiko 0721-553 represents an important milestone in Seiko's 1982 lineup. Powered by the 0721 caliber with 25j jewels beating at 36,000 bph, it delivers a 61 hours power reserve. [seikata-wm-78103e7bcd0a]

Also known as: Helmet, Bellmatic

Specifications

Movement

Kinetic

Case Material

PVD Black

Case Width

34mm

Case Thickness

8.5mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

120m

Dial Color

Cream

Jewels

25j

Frequency

36,000 bph

Power Reserve

61 hours

Year

1982

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