Seiko Cal. 6646 - 660

The Seiko 6646-660 represents an important milestone in Seiko's 1977 lineup. With its 18mm lug width and 10.7mm profile, it sits comfortably on most wrists. [seikata-wm-61a1b4522863]

Also known as: Samurai

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

10.7mm

Lug Width

18mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

140m

Dial Color

Green

Jewels

32j

Frequency

28,800 bph

Power Reserve

55 hours

Year

1977

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