Seiko Cal. 4438 - 738

The 4438-738 is a sought-after Spring Drive piece from Seiko's golden era. It features a Black dial protected by a Hardlex crystal and offers 190m of water resistance. [seikata-wm-0f5be282c981]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

10.8mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

190m

Dial Color

Black

Jewels

22j

Frequency

21,600 bph

Power Reserve

52 hours

Year

1983

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