Seiko Cal. 6644 - 390

The 6644-390 is a sought-after Quartz piece from Seiko's golden era. Powered by the 6644 caliber with 20j jewels beating at 28,800 bph, it delivers a 48 hours power reserve. [seikata-wm-abe694f66d5a]

Also known as: Rally, Silverwave

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

44mm

Case Thickness

14.1mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

200m

Dial Color

Cream

Jewels

20j

Frequency

28,800 bph

Power Reserve

48 hours

Year

1985

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