Seiko Cal. 5643 - 421

The 5643-421 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 5643 caliber with 28j jewels beating at 36,000 bph, it delivers a 46 hours power reserve. [seikata-wm-780cd7f37fe9]

Also known as: Sumo

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

11.4mm

Lug Width

20mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

150m

Dial Color

Cream

Jewels

28j

Frequency

36,000 bph

Power Reserve

46 hours

Year

1973

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