Seiko Cal. 6331 - 218

The Seiko 6331-218 represents an important milestone in Seiko's 1984 lineup. Powered by the 6331 caliber with 25j jewels beating at 21,600 bph, it delivers a 63 hours power reserve. [seikata-wm-43f3968c9059]

Also known as: Helmet, Bellmatic

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

34mm

Case Thickness

8.0mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

110m

Dial Color

White

Jewels

25j

Frequency

21,600 bph

Power Reserve

63 hours

Year

1984

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