Seiko Cal. 6639 - 613

Seiko 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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