Vintage Goodness

A few weeks ago Rt 127 held the longest garage sale. I was so excited to attend a few in the Celina, Ohio area with my mother in law. So much fun! I did not purchase much, mainly because so many people seemed to use Antique Roadshow as a price guide, but I did make a few scores.
I found a nice little tea set with a tray. I had no intention of purchasing it, but the owner shouted a deal at me.

Can you believe this was only two dollars?

I have no idea what this is made out of...it says Keystoneware. According to what minor research I have done, they manufactured both silver plate and stamped aluminum. I am thinking this is silver plate, the tray just throws me. It may be aluminum. It is probably from the late 1940s.
It was quite yucky when I bought it. But I cleaned it up with some baking soda and white vinegar, which did an excellent job of taking care of some of that...patina?. I could tell somebody once tried using a store bought silver/metal polish that ends with X as some of the silver plate is chipped off. But, as I do not plan to do anything more than set it on my dresser to corral little bits in, I do not mind. Two dollars people!
I do plan to purchase some more realistic fake flowers to put in it! These are from my daughter's collection.