Seiko Cal. 6640 - 812

The 6640-812 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6640 caliber with 22j jewels beating at 21,600 bph, it delivers a 59 hours power reserve. [seikata-wm-64d0bd82bf8b]

Also known as: UFO

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

46mm

Case Thickness

12.9mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

140m

Dial Color

Black

Jewels

22j

Frequency

21,600 bph

Power Reserve

59 hours

Year

1979

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