Seiko Cal. 6331 - 550

The Seiko 6331-550 represents an important milestone in Seiko's 1974 lineup. It features a Green dial protected by a Acrylic crystal and offers 170m of water resistance. [seikata-wm-40a2ece8cf2b]

Also known as: Bellmatic

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

40mm

Case Thickness

11.1mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

170m

Dial Color

Green

Jewels

33j

Frequency

28,800 bph

Power Reserve

49 hours

Year

1974

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