Seiko Cal. 6640 - 647

This Hand-Winding model from 1980 features a 39mm PVD Black case. Powered by the 6640 caliber with 34j jewels beating at 36,000 bph, it delivers a 57 hours power reserve. [seikata-wm-2cd3efc90c36]

Also known as: Turtle, Pogue

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

39mm

Case Thickness

13.0mm

Lug Width

20mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

130m

Dial Color

White

Jewels

34j

Frequency

36,000 bph

Power Reserve

57 hours

Year

1980

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