Seiko Cal. 6639 - 399

The Seiko 6639-399 represents an important milestone in Seiko's 1970 lineup. Powered by the 6639 caliber with 28j jewels beating at 21,600 bph, it delivers a 61 hours power reserve. [seikata-wm-fb0b67b94512]

Also known as: Sumo, UFO

Specifications

Movement

Solar

Case Material

Gold-Plated

Case Width

36mm

Case Thickness

11.3mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

130m

Dial Color

Silver

Jewels

28j

Frequency

21,600 bph

Power Reserve

61 hours

Year

1970

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