They are marked on the reverse with the Copelands Grosvenor China England mark in green. The pattern dates to 1932.
The plates do not have the pattern number but I have cups/saucers available in this pattern in another listing that have the pattern number. I have shown the number on the cup in one of the photos. I also have a stunning teapot available.Please take a look at many new items added daily. Antique porcelain, English and French china, porcelain and ceramics, silver, sterling, antique glass, estate items, antique and vintage collectibles.