Seiko Cal. 6631 - 333

The 6631-333 is a sought-after Kinetic piece from Seiko's golden era. Powered by the 6631 caliber with 24j jewels beating at 21,600 bph, it delivers a 69 hours power reserve. [seikata-wm-38ddc76c9f4f]

Also known as: Helmet, Flighty

Specifications

Movement

Kinetic

Case Material

Two-Tone

Case Width

41mm

Case Thickness

8.3mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

170m

Dial Color

Black

Jewels

24j

Frequency

21,600 bph

Power Reserve

69 hours

Year

1972

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