Seiko Cal. 6640 - 316

This Spring Drive model from 1980 features a 42mm PVD Black case. With its 19mm lug width and 12.1mm profile, it sits comfortably on most wrists. [seikata-wm-17f5ee2e70e5]

Also known as: Sportsmatic, Emperor

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

42mm

Case Thickness

12.1mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

200m

Dial Color

Champagne

Jewels

23j

Frequency

28,800 bph

Power Reserve

58 hours

Year

1980

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