Seiko Cal. 4528 - 644

This Spring Drive model from 1990 features a 37mm PVD Black case. Powered by the 4528 caliber with 28j jewels beating at 21,600 bph, it delivers a 68 hours power reserve. [seikata-wm-c6c3203f2610]

Also known as: Sportsmatic

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

37mm

Case Thickness

12.1mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

70m

Dial Color

Silver

Jewels

28j

Frequency

21,600 bph

Power Reserve

68 hours

Year

1990

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