Seiko Cal. 3866 - 709

This Spring Drive model from 1965 features a 45mm Titanium case. With its 21mm lug width and 11.7mm profile, it sits comfortably on most wrists. [seikata-wm-9a20f50fa0da]

Also known as: Tuna, Helmet

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

45mm

Case Thickness

11.7mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

160m

Dial Color

Navy

Jewels

27j

Frequency

28,800 bph

Power Reserve

61 hours

Year

1965

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