Seiko Cal. 6640 - 860

Released in 1974, the Cal. 6640 with design code 860 was part of Seiko's domestic market collection. With its 20mm lug width and 10.3mm profile, it sits comfortably on most wrists. [seikata-wm-385fa6614bc8]

Also known as: Pogue

Specifications

Movement

Automatic

Case Material

Gold-Plated

Case Width

36mm

Case Thickness

10.3mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

200m

Dial Color

Burgundy

Jewels

21j

Frequency

21,600 bph

Power Reserve

40 hours

Year

1974

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