Seiko Cal. 3881 - 821

This Spring Drive model from 1976 features a 37mm PVD Black case. The Bidirectional bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-2158dd29cfb8]

Also known as: UFO

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

37mm

Case Thickness

12.2mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

130m

Dial Color

White

Jewels

27j

Frequency

36,000 bph

Power Reserve

39 hours

Year

1976

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