Seiko Cal. 6636 - 590

The 6636-590 is a sought-after Spring Drive piece from Seiko's golden era. With its 20mm lug width and 15.4mm profile, it sits comfortably on most wrists. [seikata-wm-b48e28b48ffb]

Also known as: Tuna, Helmet

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

35mm

Case Thickness

15.4mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

140m

Dial Color

Black

Jewels

20j

Frequency

28,800 bph

Power Reserve

48 hours

Year

1966

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