Seiko Cal. 7178 - 704

This Spring Drive model from 1975 features a 36mm PVD Black case. With its 18mm lug width and 9.4mm profile, it sits comfortably on most wrists. [seikata-wm-feb0d4a46d1e]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

36mm

Case Thickness

9.4mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

50m

Dial Color

Green

Jewels

31j

Frequency

21,600 bph

Power Reserve

45 hours

Year

1975

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