Seiko Cal. 6644 - 927

The 6644-927 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6644 caliber with 32j jewels beating at 28,800 bph, it delivers a 36 hours power reserve. [seikata-wm-27f6ae03726c]

Also known as: Rally

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

42mm

Case Thickness

11.3mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

White

Jewels

32j

Frequency

28,800 bph

Power Reserve

36 hours

Year

1980

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