Thank you, Angela, for showing this butter dish, and Paul, for providing the design representation.
Simon Cottle describes RD 352842 of 26 July 1880 as a ‘butter dish’ but ascribes no Sowerby pattern number to it. Jenny Thompson describes the design as a ‘new butter’ (which is the description on the design representation).
The Thistlewood Sowerby CD-ROM catalogues show a matching design on the left of the bottom row of page 7 of Sowerby Pattern Book XI (1885), but unfortunately the actual pattern number is cropped and thus not shown. From the number sequence of the previous butter dishes shown on the same page and subsequent page of the pattern book the pattern number is most probably either in the ‘1490s’ or somewhere in the ‘1500s’ (which is also in accord with the known Sowerby pattern numbers of similar registration date).
I will add the butter dish photos to the GMB RD Database and GMB Sowerby Patterns database shortly.
Fred.