Seiko Cal. 6331 - 584

The 6331-584 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6331 caliber with 25j jewels beating at 36,000 bph, it delivers a 51 hours power reserve. [seikata-wm-6189218bdfc3]

Also known as: Helmet, UFO

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

46mm

Case Thickness

15.2mm

Lug Width

18mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

160m

Dial Color

Cream

Jewels

25j

Frequency

36,000 bph

Power Reserve

51 hours

Year

1995

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