Seiko Cal. 5640 - 999

The 5640-999 is a sought-after Quartz piece from Seiko's golden era. Powered by the 5640 caliber with 27j jewels beating at 36,000 bph, it delivers a 68 hours power reserve. [seikata-wm-4823cd844de3]

Also known as: Sea Horse

Specifications

Movement

Quartz

Case Material

Gold-Plated

Case Width

43mm

Case Thickness

12.0mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

200m

Dial Color

Silver

Jewels

27j

Frequency

36,000 bph

Power Reserve

68 hours

Year

1975

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