Seiko Cal. 5640 - 243

The Seiko 5640-243 represents an important milestone in Seiko's 1973 lineup. Powered by the 5640 caliber with 26j jewels beating at 36,000 bph, it delivers a 63 hours power reserve. [seikata-wm-53155bc1cf78]

Also known as: Emperor

Specifications

Movement

Quartz

Case Material

Gold-Plated

Case Width

36mm

Case Thickness

13.2mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

140m

Dial Color

Black

Jewels

26j

Frequency

36,000 bph

Power Reserve

63 hours

Year

1973

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