Seiko Cal. 5278 - 740

Released in 1974, the Cal. 5278 with design code 740 was part of Seiko's domestic market collection. With its 21mm lug width and 14.7mm profile, it sits comfortably on most wrists. [seikata-wm-081be9ee8e20]

Also known as: Helmet

Specifications

Movement

Kinetic

Case Material

Hardlex-Coated Steel

Case Width

35mm

Case Thickness

14.7mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

160m

Dial Color

Silver

Jewels

20j

Frequency

21,600 bph

Power Reserve

63 hours

Year

1974

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