Seiko Cal. 5643 - 421

Seiko 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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