just to add a little to Christine's informative words. Feet such as this were/are usually referred to as 'shell-ribbed' - think of the pattern on a cockle shell - it was apparently an invention patented by T/Webb in the 1860s, and appears commonly during the latter decades of the C19, on just about anything where feet were involved. Unfortunately, it occurs also on pieces from the first third of the C20.
Unfortunately, that doesn't suggest remotely this piece has any connection with T/Webb - but if you type 'shell-ribbed feet' into the boards search facility there is much to read of interest.
My opinion remains that this has some connection to a flower stand/posy/float bowl/epergne, and the fact that the central hole is open doesn't alter the possibility that a central metal insert might have been there originally.