Seiko Cal. 6690 - 218

The 6690-218 is a sought-after Spring Drive piece from Seiko's golden era. With its 18mm lug width and 9.3mm profile, it sits comfortably on most wrists. [seikata-wm-660fd9046965]

Also known as: Silverwave, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

34mm

Case Thickness

9.3mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

60m

Dial Color

Black

Jewels

26j

Frequency

36,000 bph

Power Reserve

41 hours

Year

1971

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