Seiko Cal. 3899 - 640

The 3899-640 is a sought-after Spring Drive piece from Seiko's golden era. The Bidirectional bezel and 36mm case give it a distinctive presence on the wrist. [seikata-wm-14be927939be]

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

36mm

Case Thickness

10.1mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

50m

Dial Color

Cream

Jewels

25j

Frequency

36,000 bph

Power Reserve

59 hours

Year

1972

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