James Deakin started in business c. 1865, and was styled as James Deakin & Sons as from the 1880's. They are often quoted as being out of business by 1940, but they survived until around 1950, as the below advertisement from 1949 proves.

James Deakin & Sons - Sheffield - 1949
I would put your piece to around the early years of the 20th century.
Sorry, I can't help with the name of a pattern.
Trev.