Seiko Cal. 0731 - 104

This Spring Drive model from 1991 features a 44mm PVD Black case. It features a Green dial protected by a Sapphire crystal and offers 150m of water resistance. [seikata-wm-8fd2e9902d16]

Also known as: UFO, Bellmatic

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

44mm

Case Thickness

13.1mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

150m

Dial Color

Green

Jewels

24j

Frequency

28,800 bph

Power Reserve

41 hours

Year

1991

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