Seiko Cal. 4528 - 990

The Seiko 4528-990 represents an important milestone in Seiko's 1970 lineup. Powered by the 4528 caliber with 34j jewels beating at 36,000 bph, it delivers a 43 hours power reserve. [seikata-wm-6b4bd447c435]

Also known as: Helmet, Navigator

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

35mm

Case Thickness

10.6mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

110m

Dial Color

Green

Jewels

34j

Frequency

36,000 bph

Power Reserve

43 hours

Year

1970

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