Seiko Cal. 6331 - 175

This Spring Drive model from 1967 features a 39mm Hardlex-Coated Steel case. Powered by the 6331 caliber with 18j jewels beating at 36,000 bph, it delivers a 37 hours power reserve. [seikata-wm-306a1d88e8ba]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

12.4mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

40m

Dial Color

Green

Jewels

18j

Frequency

36,000 bph

Power Reserve

37 hours

Year

1967

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