French modernist hanging lamp made in the 1950's,attributed to Mathieu Mategot , you can also Google  it to find several example on other dealer's sites. It has a long arm with a  simple mechanism to hold the heavy glass globe with a lens de Fresnel . Fresnel  lens (/ˈfrɛznəl/ FREZ-nəl or /freɪˈnɛl/ fray-NEL) is a type of compact lens  originally developed by French physicist Augustin-Jean Fresnel for lighthouse  ,the lens reduces the amount of material required compared to a conventional  lens by dividing the lens into a set of concentric annular sections.The pendants  attach to the ceiling via a conical canopy that adjoins the stem. With its clean  lines and simple form this hanging lamp is a winning addition to any style of  interior from classic Mid-Century Modern to contemporary.
Original socket in  working condition Size arm rod H.32 )  glass holophane globe H.6 x D.14 , mounted H.39 ,good antique  condition ,there is some scratches from normal use and  some superficial  oxidation ( darker spots)