On Another Wavelength: Zenith Launches its First Violet Chronograph Movement with the Defy 21 Ultraviolet (Updated with Live Photos) | WatchTime - USA's No.1 Watch Magazine
Introducing the Zenith DEFY 21 Ultrablue - Revolution
Zenith Unveils Its Ultra Color Box Set With 8 Vibrant Defy 21 Watches – Robb Report
On Another Wavelength: Zenith Launches its First Violet Chronograph Movement with the Defy 21 Ultraviolet (Updated with Live Photos) | WatchTime - USA's No.1 Watch Magazine
Introducing: The Zenith Defy 21 Ultraviolet - Hodinkee