Seiko Cal. 4427 - 392

This Hand-Winding model from 1965 features a 35mm Titanium case. It features a Black dial protected by a Mineral crystal and offers 150m of water resistance. [seikata-wm-040c09ee43cc]

Also known as: Helmet

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

35mm

Case Thickness

14.6mm

Lug Width

21mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

150m

Dial Color

Black

Jewels

30j

Frequency

28,800 bph

Power Reserve

59 hours

Year

1965

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