I have a copy of the Pressed Glass Club repro catalogue mentioned above if you want anything checking. Dates are 1880-1890 with some additional pages from 1903 and 1910.
The introduction to the reprints says that "the entire stock of moulds and patterns belonging to the Neville Glassworks" were purchased by Davidson's in 1881 after Neville's closed in 1880. In 1885 Davidson bought "all of the moulds belonging to WH Heppell" and "those of Thomas Gray & Co of Gateshead around the same time." So it is known that Davidson had a huge range of patterns and moulds at this time, few of which show up as designed registered to them!