Backstamps
Although very different designs, curiously both the two first class patterns known as "Wisteria" and "Gothic Arch / "Mitre" pattern exhibit  identical pattern registration numbers as shown above. The patterns were never named and can be found on chinaware used by the Red Star Line and on an Australian Yacht Club china.
Registration number 117214 dates from 1889 and number 324028 dates from 1898. As mentioned elsewhere  Stonier & C^o L^TD of Liverpool where the supply agents for the White Star Line, not manufacturers of the chinaware that carries their name.
There are different permutations of back stamp marks, two as shown above are typical, as are no marks at all, some without the word "Liverpool". Some have manufacturing dates (e.g., 3/1906) some do not, all of which suggests that many makers in the Potteries made this china.