Is this a real Florence Knoll table base?  

I recently picked up a 80” long oval Knoll Florence Knoll marble table very cheap. 
its a newer version but is not marked on one of the feet which i have seen on new versions, this might be 10-15 years old. 
I own several vintage 60’s wood versions of this table but they have slightly different construction to the base. 
Everything looks correct, size, construction, top looks perfect etc but would be nice to know for sure. 
Dont know if there are any knock-offs of this table either.