Seiko Cal. 4431 - 343

This Spring Drive model from 1972 features a 37mm Two-Tone case. It features a Champagne dial protected by a Acrylic crystal and offers 90m of water resistance. [seikata-wm-55c16398c751]

Also known as: Tuna, UFO

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

37mm

Case Thickness

15.5mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

90m

Dial Color

Champagne

Jewels

17j

Frequency

36,000 bph

Power Reserve

51 hours

Year

1972

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