Seiko Cal. 6656 - 640

Released in 1988, the Cal. 6656 with design code 640 was part of Seiko's domestic market collection. With its 20mm lug width and 14.6mm profile, it sits comfortably on most wrists. [seikata-wm-cbf4643400cf]

Also known as: Sumo, Panda

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

44mm

Case Thickness

14.6mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

180m

Dial Color

White

Jewels

26j

Frequency

21,600 bph

Power Reserve

64 hours

Year

1988

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