very tasty Anne. In the wild you hardly ever see Walsh pieces like this, and a scarce item I should think too. You appear to be the owner of what is suggested by Reynolds as being a piece designed by Clyne Farquharson - see pp. 29 and 54 of 'The Glass of John Walsh Walsh' by Reynolds - at the top of both pages, ................... unfortunately, you may not have the book.
Will see if I can ferret out the name of the pattern by looking at those miniscule drawings at the rear of the book, but details are so small that its unlikely.
I get the impression that yours doesn't have a better known pattern name such as Kendal, Leaf, Albany etc. Obviously, there either was or still remains some doubt as to whether this pattern was Farquharson's design, whether that situation has changed I don't know. I wonder if Nigel might have a more up-to-date take on this one.
P.S. Apparently it's called 'Brendon'

The backstamp variations are.............. just the word Walsh is suggested as being c. 1926 - 30, and Walsh combined with England is indicated as c. 1930 - 51 ......... presumably there may be a little leeway on this.
P.P.S. your pattern Anne is indicated as have the coded designation WE - according to Reynolds this means it should carry the backstamp of WALSH ENGLAND. Perhaps you might have another look on the foot.