Seiko Cal. 3840 - 987

This Hand-Winding model from 1976 features a 40mm PVD Black case. With its 21mm lug width and 15.1mm profile, it sits comfortably on most wrists. [seikata-wm-0472121db96e]

Also known as: Bullhead

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

40mm

Case Thickness

15.1mm

Lug Width

21mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

200m

Dial Color

Blue Sunburst

Jewels

21j

Frequency

36,000 bph

Power Reserve

63 hours

Year

1976

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