That heavy scalloped foot doesn’t accord with any of the Greener designs that I have on file, Christine.
The nearest pieces that I have been able to find with that heavy scalloped foot appear on pieces from the late 1850s or early 1860s (and there are certainly lots of designs, registered and unregistered, on Neil Harris’s Manchester glass website https://sites.google.com/site/molwebbhistory/Home
in similar vein). I’m also minded towards the same sort of date by the knopped stem.
The nearest significant Royal events within that time frame would seem to be Prince Albert’s death in December 1861 and Victoria’s Silver Jubilee in June 1862.
I suppose another option could be tableware for the Royal households – but would Queen Victoria really have been amused to see common pressed glass on show…..?