Seiko Cal. 3899 - 640

The 3899-640 is a sought-after Kinetic piece from Seiko's golden era. Powered by the 3899 caliber with 19j jewels beating at 36,000 bph, it delivers a 49 hours power reserve. [seikata-wm-97efc0fa5e6b]

Also known as: Sumo

Specifications

Movement

Kinetic

Case Material

Titanium

Case Width

42mm

Case Thickness

11.5mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

30m

Dial Color

Burgundy

Jewels

19j

Frequency

36,000 bph

Power Reserve

49 hours

Year

1968

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