Seiko Cal. 6640 - 714

The Seiko 6640-714 represents an important milestone in Seiko's 1978 lineup. Powered by the 6640 caliber with 17j jewels beating at 21,600 bph, it delivers a 43 hours power reserve. [seikata-wm-a0ca9a10bb6c]

Also known as: Crown

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

45mm

Case Thickness

8.0mm

Lug Width

21mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

150m

Dial Color

Blue Sunburst

Jewels

17j

Frequency

21,600 bph

Power Reserve

43 hours

Year

1978

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