Seiko Cal. 4420 - 674

The 4420-674 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 4420 caliber with 25j jewels beating at 28,800 bph, it delivers a 67 hours power reserve. [seikata-wm-39652ace42dc]

Also known as: Helmet, Sportsmatic

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

38mm

Case Thickness

15.6mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

150m

Dial Color

Burgundy

Jewels

25j

Frequency

28,800 bph

Power Reserve

67 hours

Year

1975

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