Seiko Cal. 4423 - 391

The Seiko 4423-391 represents an important milestone in Seiko's 1965 lineup. It features a Black dial protected by a Mineral crystal and offers 180m of water resistance. [seikata-wm-baec6d11d540]

Also known as: Helmet, World Timer

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

36mm

Case Thickness

12.3mm

Lug Width

21mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

180m

Dial Color

Black

Jewels

21j

Frequency

21,600 bph

Power Reserve

59 hours

Year

1965

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