Seiko Cal. 6639 - 613

The 6639-613 is a sought-after Automatic piece from Seiko's golden era. Powered by the 6639 caliber with 36j jewels beating at 36,000 bph, it delivers a 53 hours power reserve. [seikata-wm-ec98927d30b6]

Also known as: UFO, Arnie

Specifications

Movement

Automatic

Case Material

Gold-Plated

Case Width

43mm

Case Thickness

9.1mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

70m

Dial Color

Black

Jewels

36j

Frequency

36,000 bph

Power Reserve

53 hours

Year

1977

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