Seiko Cal. 4431 - 945

This Spring Drive model from 1993 features a 40mm Titanium case. Powered by the 4431 caliber with 27j jewels beating at 21,600 bph, it delivers a 43 hours power reserve. [seikata-wm-1075a12a74ed]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

40mm

Case Thickness

9.4mm

Lug Width

18mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

60m

Dial Color

White

Jewels

27j

Frequency

21,600 bph

Power Reserve

43 hours

Year

1993

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