Seiko Cal. 6690 - 821

This Spring Drive model from 1971 features a 43mm Two-Tone case. Powered by the 6690 caliber with 27j jewels beating at 36,000 bph, it delivers a 39 hours power reserve. [seikata-wm-a8ebfd12fd7f]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

43mm

Case Thickness

15.8mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

Cream

Jewels

27j

Frequency

36,000 bph

Power Reserve

39 hours

Year

1971

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