Seiko Cal. 6331 - 947

The Seiko 6331-947 represents an important milestone in Seiko's 1981 lineup. Powered by the 6331 caliber with 30j jewels beating at 21,600 bph, it delivers a 59 hours power reserve. [seikata-wm-55dc5f92f8e5]

Also known as: Tuna, UFO

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

37mm

Case Thickness

9.7mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

30m

Dial Color

Silver

Jewels

30j

Frequency

21,600 bph

Power Reserve

59 hours

Year

1981

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