Seiko Cal. 4427 - 813

This Spring Drive model from 1975 features a 39mm PVD Black case. It features a Navy dial protected by a Acrylic crystal and offers 40m of water resistance. [seikata-wm-ed2cccd3e078]

Also known as: Sportsmatic

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

39mm

Case Thickness

10.0mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

40m

Dial Color

Navy

Jewels

20j

Frequency

28,800 bph

Power Reserve

67 hours

Year

1975

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