Seiko Cal. 5640 - 409

The Seiko 5640-409 represents an important milestone in Seiko's 1980 lineup. Powered by the 5640 caliber with 17j jewels beating at 21,600 bph, it delivers a 65 hours power reserve. [seikata-wm-34ff6177ac1d]

Also known as: Silverwave, Crown

Specifications

Movement

Kinetic

Case Material

Stainless Steel

Case Width

38mm

Case Thickness

8.3mm

Lug Width

18mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

200m

Dial Color

Green

Jewels

17j

Frequency

21,600 bph

Power Reserve

65 hours

Year

1980

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