Custom Knoll Table?  

Email them and ask? Is that some kind of patinated bronze? Looks cool, I know they did bronze finish barcelonas, sorry cant be of more help

The base and the table top edge are the clues that indicate this is not a Knoll table.  Even though some ordered the base and tops of the tables with a differnet finish, Florence Knoll intended the table (which is built like a tank) with a mirror polished finish base to appear light and appear almost invisible making the top appear as if it is floating in mid air.
Stow Davies did convincing almost dead on copies of the Knoll oval top tables with various finishes on the base and custon veneered/marquetry wood tops. 
It is hard to say who made your table, without seeing the underside.
 

Thank you for the responses. I will try to get some photos of the bottom.