Some success with linking the Sowerby RD numbers for 13 July 1880 with their Sowerby pattern numbers:
Roy’s opalescent blue dish, RD 352137, is Sowerby pattern 1486 (at least that’s what I think the number is because the printing in the catalogue is a little smudged) which is shown on page 10 of the Sowerby pattern book IX, 1882. .
RD 352133 corresponds to Sowerby pattern number 1507, shown on the same page of the pattern book.
RD 352134 corresponds to Sowerby pattern number 1508, also shown on the same page.
RD 352135 corresponds to Sowerby pattern number 1506, also shown on the same page.
Interestingly, pattern numbers 1506, 1507 and 1508 are actually heavily decorated, whereas the design representations only show the undecorated shape.
No luck so far with a Sowerby pattern number corresponding to RD 352136.
It would seem, therefore, that Simon Cottle is in error concluding that Sowerby pattern 1472 correlates with Sowerby RD 352137 of 13 July 1880.
Does anyone have photos of actual pieces from Sowerby patterns 1506, 1507 or 1508 to show, please?
Fred.