Seiko Cal. 3870 - 222

This Spring Drive model from 1970 features a 45mm Titanium case. With its 22mm lug width and 10.9mm profile, it sits comfortably on most wrists. [seikata-wm-33e16e9fe5cf]

Also known as: Tuna, Helmet

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

45mm

Case Thickness

10.9mm

Lug Width

22mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

60m

Dial Color

Green

Jewels

24j

Frequency

28,800 bph

Power Reserve

48 hours

Year

1970

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