Seiko Cal. 3899 - 687

The Seiko 3899-687 represents an important milestone in Seiko's 1969 lineup. Powered by the 3899 caliber with 25j jewels beating at 28,800 bph, it delivers a 43 hours power reserve. [seikata-wm-63604fcc11cd]

Also known as: Turtle, Helmet

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

9.6mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

40m

Dial Color

Navy

Jewels

25j

Frequency

28,800 bph

Power Reserve

43 hours

Year

1969

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