Real or knock-off Eero Saarinen tulip side table?  

You are correct -- that is not a Knoll table.

In addition to the characteristics you noted, the base/tabletop attachment is very wrong. Knoll side tables don't have visible screws holding the two pieces together. Instead, a threaded stud protrudes from the top of the base, and there's a single threaded hole in the center of the underside of the tabletop, The tabletop just screws directly onto the base.

I have a pair of early side tables that have screws, there've been a couple of iterations..

This one doesn't look so good from the bottom though. What are dimensions?

Some table porn-- the heavy cast iron base is distinct.

Table porn indeed.

If the base on the OP's table is a knockoff, as I believe it is, it's one of the better ones I've seen. At least they got the profile contours close. I have never, however, seen a faux wood-grain laminate top on a Knoll table.

I have a little tulip end table, old, with the same underside of the base as objectworship's above, except with no screws. The profile of the base is exactly correct. It has a plastic woodgrain top, unfortunately very, very worn.

Love to see some pics, spanky!

if you see screws on a true table, they were added sometime during its life. wood screws were never used on this design. the idea was to have the table "dripping" into the base hence the center screw assembly. plus the base should have evidence of a felt ring and rilsan coating. most tables will have letters/nmbrs stamped in their bases, such as BR-51

@lizzy See Knoll table above for apparently original screws; also note that letter-number designation codes on aluminum bases are not relevant to the side tables, because the side tables are not aluminum.