The Zenith El Primero Chronomaster Grande Date Full Open has a 46mm case and an automatic El Primero 4047B movement. The dial is made of sapphire crystal, giving a clear view of the self-winding caliber. The hands are coated with SuperLuminova for easy reading in the dark. This model, reference 51.2530.4047/78.C810, has a stainless steel case with a touch of pink gold on the bezel. It comes with a brown calf skin strap,