ABlogToWatch: Zenith El Primero 410 Watch - Another Ode To The Past---The new Zenith 410 ref 03.2091.410/01.C494 shares most of its design and technical attributes with the 410 LE we showed you back in October. With a 42mm steel case and sapphire on both sides, the 410 forgoes the contrasting white-on-grey coloring and star markers at two and ten seen on the limited model, opting instead for uniform silver dial design.