Hi Rose. I spotted that ebay link, but looks like the seller isn't sure its even RAYRIC. Here's a pic. of my stoneware lidded dish. The paper label was on it when I bought it. I guess they didn't have any info on it either.
Unfortunately a lot of these small pottery workshops just disappear over time, or are taken over by someone else resulting in name changes, so I'm not holding my breath. I think the dish is quite old.