Seiko Cal. 7138 - 278

This Spring Drive model from 1983 features a 41mm Titanium case. It features a Black dial protected by a Sapphire crystal and offers 50m of water resistance. [seikata-wm-3bc23358550f]

Also known as: Tuna, World Timer

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

41mm

Case Thickness

10.7mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

50m

Dial Color

Black

Jewels

22j

Frequency

28,800 bph

Power Reserve

55 hours

Year

1983

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