Seiko Cal. 4428 - 317

The 4428-317 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 4428 caliber with 30j jewels beating at 28,800 bph, it delivers a 68 hours power reserve. [seikata-wm-d8320c3d8c1e]

Also known as: Sportsmatic

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

43mm

Case Thickness

9.1mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

70m

Dial Color

Cream

Jewels

30j

Frequency

28,800 bph

Power Reserve

68 hours

Year

1972

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