F. M. DuRoy - Chronographe et “Oignon”

European Watch Clock and Jewellery Fair 1992 BF 259
Seifwinding or handwourid chronographs with centre seconds, short-time measurements up to 12 hours, date calendar and moon-phases. Their % mmdiameter case is made of 18K gold. (F.M. DuRoy - Chronographe et “Oignon”)