Robbins Table

I have a Robbins Improved Extention Table.  I have done some research on it, but can't find another one just like it.  It has the 5 large round carved legs and 6 (I believe) leaves that make it 12 feet when fully extended.  It has 6 chairs that may have come with it.The thing is, it is oval, I can only find rectangular tables with these legs.  Wondering if others have seen this type, are they rare? Does this increase the value? Any idea on value?

thanks