here are the remaining four Registrations - 334640 - 41 - 42 and 43, and as usual these were intended to protect just the shape, and none of the decoration.
Just by chance I noticed that there's an example of the first of these in Sheilagh Murray's book 'THE PEACOCK AND THE LIONS' - page 62 I think - plate 8 - and her example is in opalescent glass, similar to the piece shown by Fred at the beginning of this thread. So, if you have the book, you can see how attractive Murray's vase is, with what the lady describes as 'Classical figures' on each of the four middle panels.
Murray's comments regarding datelines for the manufacture of Sowerby's 'opalescent' glass is particularly interesting, especially as she also comments on the same product from Lalique, but which was produced at a later date - but thought by many to have been a Lalique invention.