Zenith El Primero de Luca MK1 with the nice and sought after white porcelain dial.
Watch in good used and unpolished condition with light scratches and marks. 
The watch is in completely original condition:
White porcelain dial without "El Primero" printing (nice tritium patina)
Mat black bezel insert
Original hands
Original pushers and "no logo" crown
Small Zenith logo engraving on the case-back
Leather strap (generic genuine croco) with original Zenith buckle
The movement is in clean condition, checked from my watchmaker (no previous service history), has a good timekeeping and amplitude, all chronographs and date function are working properly.