Black is the new black with the all-black titanium limited edition (100 models) Zenith Defy Xtreme Open Stealth Chronograph (pictured left). An El Primero (a famously advanced automatic movement developed in 1969), it features the latest caliber 4021SX automatic movement from their brand-defining engines. Appearing to have high speed fan blades for chronograph registers, the Stealth version ends up more dangerous-looking than the original Defy Xtreme Citius, Altius and Fortius. (Just try your best not to laugh at the ridiculous looking models in their ads, I failed.) The new Stealth also comes in an edition of white titanium, also limited to 100.
Another new El Primero, the Rectangular Grande Port-Royal Tourbillon Chronograph with El Primero 4007 (pictured above right) was inspired by martial arts and New York City bridges according to Thierry Nataf, CEO and Artistic Director of Zenith.
See more info here and for an overview of vintage El Primeros go here.