Seiko Cal. 6639 - 364

Seiko 6639-364

The 6639-364 is a sought-after Automatic piece from Seiko's golden era. Powered by the 6639 caliber with 28j jewels beating at 21,600 bph, it delivers a 45 hours power reserve. [seikata-wm-d9870e820f3d]

Also known as: Turtle, Golden Tuna

Specifications

Movement
Automatic
Case Material
Titanium
Case Width
44mm
Case Thickness
12.9mm
Lug Width
20mm
Crystal
Acrylic
Bezel
Coin-Edge
Water Resistance
90m
Dial Color
Black
Jewels
28j
Frequency
21,600 bph
Power Reserve
45 hours
Year
1993

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