Zenith Defy El Primero 21 Ref. 95.9000.9004/78.R582, A Titanium Automatic Chronograph Wristwatch With Power Reserve, Circa 2021 Available For Immediate Sale At Sotheby's
Zenith Launches the DEFY 21 Black Ceramic Boutique Edition in the U.S. – Robb Report
Zenith - Defy El Primero 21, new 2018 models | Time and Watches | The watch blog