Seiko Cal. 6641 - 837

This Spring Drive model from 1990 features a 40mm PVD Black case. With its 20mm lug width and 14.4mm profile, it sits comfortably on most wrists. [seikata-wm-7600d9c28f55]

Also known as: UFO, Bellmatic

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

40mm

Case Thickness

14.4mm

Lug Width

20mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

100m

Dial Color

Green

Jewels

23j

Frequency

36,000 bph

Power Reserve

71 hours

Year

1990

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