Seiko Cal. 5636 - 261

The Seiko 5636-261 represents an important milestone in Seiko's 1966 lineup. With its 18mm lug width and 14.9mm profile, it sits comfortably on most wrists. [seikata-wm-73eaa36d0eb0]

Also known as: Helmet, Baby Tuna

Specifications

Movement

Solar

Case Material

Titanium

Case Width

41mm

Case Thickness

14.9mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

180m

Dial Color

Navy

Jewels

30j

Frequency

36,000 bph

Power Reserve

52 hours

Year

1966

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