Garabaldi, hold it up to a light bulb, and if you can see light through it, it is bone china; if not, it is earthenware. The 'pattern' looks like the rare brown Willow, but I would have to see more of the pattern to be exactly sure. The green & yellow does not look original to the plate. See if you can remove/scrape the green/yellow with your fingernail. Breezie