I was looking for something similar a number of years ago and couldn't find one. I don't think there is such a design in square. I did find a beautiful square plateau, but it had scrollwork on the top and more ornate feet- a bit fancier than I had wanted but it was beautiful. Can't recall what company I bought it from any more....was too long ago, but it was direct from a company that sold only cake stands - not a site like Amazon.
I just looked on ebay and saw quite a few really nice ones! :)
Silver Rectangle Cake Stand
with beaded edging
14 x 17, 6" Tall
The hammered look: