Seiko Cal. 5640 - 667

Released in 1978, the Cal. 5640 with design code 667 was part of Seiko's domestic market collection. Powered by the 5640 caliber with 25j jewels beating at 28,800 bph, it delivers a 51 hours power reserve. [seikata-wm-9714983de564]

Also known as: Crown

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

43mm

Case Thickness

15.9mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

130m

Dial Color

Champagne

Jewels

25j

Frequency

28,800 bph

Power Reserve

51 hours

Year

1978

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