Seiko Cal. 0728 - 687

Released in 1970, the Cal. 0728 with design code 687 was part of Seiko's domestic market collection. With its 19mm lug width and 10.9mm profile, it sits comfortably on most wrists. [seikata-wm-a364ebec09ed]

Also known as: Helmet, Navigator

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

36mm

Case Thickness

10.9mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

180m

Dial Color

Green

Jewels

17j

Frequency

28,800 bph

Power Reserve

59 hours

Year

1970

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