Seiko Cal. 3820 - 671

This Spring Drive model from 1981 features a 37mm PVD Black case. With its 21mm lug width and 13.5mm profile, it sits comfortably on most wrists. [seikata-wm-284546fd7a0a]

Also known as: Monster

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

37mm

Case Thickness

13.5mm

Lug Width

21mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

100m

Dial Color

Navy

Jewels

17j

Frequency

28,800 bph

Power Reserve

60 hours

Year

1981

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