Seiko Cal. 5646 - 647

The 5646-647 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 5646 caliber with 20j jewels beating at 21,600 bph, it delivers a 67 hours power reserve. [seikata-wm-0e4761f8025f]

Also known as: Crown

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

38mm

Case Thickness

8.6mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

150m

Dial Color

Navy

Jewels

20j

Frequency

21,600 bph

Power Reserve

67 hours

Year

1971

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