not sleepy again Anne

- well done and big thanks for the detective work - I had a feeling it might have been Sowerby.............. fortunately, it's only rarely that we get this sort of error on the lozenges.
This design does look to be Registration No. 267742 with the date you mention, and seems to appear first on a bowl of some description as can be seen in the attached picture from the National Archives - showing this pattern of vertical lines of diamonds. No idea of the size of the original bowl though.
Like this creamer, many factories produced a variety of shapes subsequent to the original date of Registration, all of which were decorated with the original pattern/design, and made perhaps over a number of years, and most (or perhaps all) carrying the same Registration diamond lozenge details (or simply a No. only if Registered after January 1884). This design of vertical rows of diamonds for Rd. 267742 looks to have been used on at least two other shapes...i.e. this creamer and a sugar, although there may be others we've not yet found.
Registration 267743 is unrelated............ it shows a shallow bowl with type of rope pattern style lipping, a clear body and star on base. If anyone wants to see this, please ask, and I can watermark and post later today.
This creamer, and Christine Young's sugar showing in your link, were separate shapes produced subsequent to the original bowl in November 1872 - although I've no idea how much later.
Perhaps someone else might know this by checking the dates of their first appearances in the Sowerby catalogues.
Both 267742 and 267743 are included in Simon Cottle's booklet 'SOWERBY - GATESHEAD GLASS', although neither Registration is provided with a description as to shape or purpose.
Anyway, great piece of Victorian tableware, and a good find hegeman.
As usual a big thanks to the Trustees of the National Archives at Kew for their continued permission to use these images.