Special brutalist lamp made by the German Peill & Putzler in the 1960s.
 
These lamps were manufactured using a special technique in which copper spheres with openings were placed in glass furnaces. Then the glass was blown into it. Due to the high temperatures, the copper was affected and discolored on the glass balls, which resulted in the special patina.
 
These lamps are often (wrongly?) attributed to Nanny Still.