Seiko Cal. 3840 - 451

This Spring Drive model from 1977 features a 40mm Hardlex-Coated Steel case. With its 22mm lug width and 10.2mm profile, it sits comfortably on most wrists. [seikata-wm-3b2b372f49a3]

Also known as: Tuna, UFO

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

10.2mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

160m

Dial Color

Navy

Jewels

26j

Frequency

21,600 bph

Power Reserve

59 hours

Year

1977

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