Seiko Cal. 6640 - 877

Released in 1965, the Cal. 6640 with design code 877 was part of Seiko's domestic market collection. With its 21mm lug width and 13.4mm profile, it sits comfortably on most wrists. [seikata-wm-e02fbf6fd75e]

Also known as: Turtle, UFO

Specifications

Movement

Quartz

Case Material

Gold-Plated

Case Width

46mm

Case Thickness

13.4mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

200m

Dial Color

Silver

Jewels

33j

Frequency

21,600 bph

Power Reserve

52 hours

Year

1965

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