Seiko Cal. 6643 - 166

The Seiko 6643-166 represents an important milestone in Seiko's 1970 lineup. With its 20mm lug width and 13.9mm profile, it sits comfortably on most wrists. [seikata-wm-3bdb2117ff24]

Also known as: Sportsmatic, Bellmatic

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

39mm

Case Thickness

13.9mm

Lug Width

20mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

60m

Dial Color

Navy

Jewels

22j

Frequency

36,000 bph

Power Reserve

70 hours

Year

1970

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