Seiko Cal. 6649 - 831

The 6649-831 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6649 caliber with 19j jewels beating at 28,800 bph, it delivers a 37 hours power reserve. [seikata-wm-b88ba899ef70]

Also known as: Monster, Tuna

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

45mm

Case Thickness

13.7mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

180m

Dial Color

Cream

Jewels

19j

Frequency

28,800 bph

Power Reserve

37 hours

Year

1966

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