Seiko Cal. 5644 - 930

The 5644-930 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 5644 caliber with 30j jewels beating at 36,000 bph, it delivers a 67 hours power reserve. [seikata-wm-a8f56bdfd10d]

Also known as: Navigator

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

44mm

Case Thickness

10.5mm

Lug Width

18mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

130m

Dial Color

Silver

Jewels

30j

Frequency

36,000 bph

Power Reserve

67 hours

Year

1978

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