Seiko Cal. 6616 - 731

Released in 1970, the Cal. 6616 with design code 731 was part of Seiko's domestic market collection. With its 19mm lug width and 13.6mm profile, it sits comfortably on most wrists. [seikata-wm-ca6fa6f60fa8]

Also known as: Samurai, Monster

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

13.6mm

Lug Width

19mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

70m

Dial Color

Black

Jewels

33j

Frequency

21,600 bph

Power Reserve

43 hours

Year

1970

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