Seiko Cal. 5639 - 640

The 5639-640 is a sought-after Automatic piece from Seiko's golden era. Powered by the 5639 caliber with 23j jewels beating at 28,800 bph, it delivers a 43 hours power reserve. [seikata-wm-6562b5de3829]

Also known as: World Timer

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

37mm

Case Thickness

14.5mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

30m

Dial Color

Burgundy

Jewels

23j

Frequency

28,800 bph

Power Reserve

43 hours

Year

1970

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