Seiko Cal. 6240 - 687

This Spring Drive model from 1978 features a 39mm PVD Black case. Powered by the 6240 caliber with 31j jewels beating at 21,600 bph, it delivers a 71 hours power reserve. [seikata-wm-4f3c7078ab7b]

Also known as: Bullhead, UFO

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

39mm

Case Thickness

14.3mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

140m

Dial Color

Green

Jewels

31j

Frequency

21,600 bph

Power Reserve

71 hours

Year

1978

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