Seiko Cal. 5644 - 990

The 5644-990 is a sought-after Automatic piece from Seiko's golden era. Powered by the 5644 caliber with 22j jewels beating at 21,600 bph, it delivers a 51 hours power reserve. [seikata-wm-b5c47e9ebe8a]

Also known as: Silverwave, Navigator

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

36mm

Case Thickness

10.6mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

190m

Dial Color

Black

Jewels

22j

Frequency

21,600 bph

Power Reserve

51 hours

Year

1971

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