Seiko Cal. 5640 - 824

The 5640-824 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 5640 caliber with 31j jewels beating at 36,000 bph, it delivers a 72 hours power reserve. [seikata-wm-1ffd731dc4e6]

Also known as: Rally

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

9.1mm

Lug Width

21mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

120m

Dial Color

Black

Jewels

31j

Frequency

36,000 bph

Power Reserve

72 hours

Year

1967

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