It is no wonder than none of our readers were able to identify this stuff from my parents' basement, which came via my Grandpa via his Mom, I think.
It turns out that it is so rare that the china and jewelry appraiser said she knew these existed, but had never seen them. It's gold-plated Lenox china. They did not make very much of it.
She suggested letting Sotheby's take a look at it all. I'd keep a couple of pieces for sentiment's sake, but would never use fully gold-plated dinner plated, coffee cups and saucers, and soup bowls. Now I'm greedily curious about market value. That little one in the middle is one of the 12 soup bowls, which looks more suited for an offering to a Greek god than for consomme.