I think the Pressed Glass Collectors Club have made an inference on the pattern. The plate they show is of an actual piece (it has chips) and not copied from a catalogue. It would be interesting to see the image from the actual catalogue. The item shown is identical to Percival Vickers, which was made in sizes 3.5, 4, 4.5, 5, 6, 7, 8, 9 inches.
There's no doubt in my mind that some of the early plate patterns, before say 1845, were made for several manufacturers. My feeling with this design is that it is a bit later, and unlikely to be replicated across manufacturers, unless the same mould was being sold on. In this case it's difficult to see it being the same mould as the listed sizes are different.