Zenith caliber 143-6 (Excelsior Park 4) is Swiss manual-winding movement from 1940’s.
Triple chronograph
Dial indication – 60s, 30/45 min, 12h
Manual-winding movement with 17 jewels
f = 18000 A/h
Diameter: 31.58 mm
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Zenith caliber 143-6 watch parts