Seiko Cal. 6656 - 640

Released in 1986, the Cal. 6656 with design code 640 was part of Seiko's domestic market collection. With its 18mm lug width and 8.5mm profile, it sits comfortably on most wrists. [seikata-wm-d9f100af8aca]

Also known as: Baby Tuna

Specifications

Movement

Kinetic

Case Material

Titanium

Case Width

46mm

Case Thickness

8.5mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

170m

Dial Color

Green

Jewels

25j

Frequency

36,000 bph

Power Reserve

47 hours

Year

1986

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