Seiko Cal. 6644 - 864

The 6644-864 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6644 caliber with 27j jewels beating at 21,600 bph, it delivers a 60 hours power reserve. [seikata-wm-6cff7ea3241c]

Also known as: Sumo

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

34mm

Case Thickness

13.1mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

110m

Dial Color

Green

Jewels

27j

Frequency

21,600 bph

Power Reserve

60 hours

Year

1972

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