Seiko Cal. 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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