Seiko Cal. 0721 - 930

The Seiko 0721-930 represents an important milestone in Seiko's 1971 lineup. With its 20mm lug width and 12.4mm profile, it sits comfortably on most wrists. [seikata-wm-92cbde1fdf76]

Also known as: Helmet, Sportsmatic

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

45mm

Case Thickness

12.4mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

140m

Dial Color

Silver

Jewels

35j

Frequency

28,800 bph

Power Reserve

37 hours

Year

1971

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