Adam â€” You will find full discussion of your American lacy/opalescent plates in the link at the start of this topic. I did not know that it came in different sizes.
The range that started this thread off is in flint, press-moulded with the design, and is illustrated in BGbtW. These were made by an unidentified British glassworks.
I now have both known types of this range in stock, as I bought the TOWER OF EMPIRE
version that is illustrated in Dodsworth at Woking on Sunday.