Seiko Cal. 6331 - 330

The Seiko 6331-330 represents an important milestone in Seiko's 1969 lineup. Powered by the 6331 caliber with 26j jewels beating at 28,800 bph, it delivers a 48 hours power reserve. [seikata-wm-d357cf7a6c4d]

Also known as: Helmet, Goldfeather

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

41mm

Case Thickness

8.7mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

90m

Dial Color

Green

Jewels

26j

Frequency

28,800 bph

Power Reserve

48 hours

Year

1969

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