Marks from my grandmother's mirror

I am sorting through my aunt’s estate. Amongst the items are a number of silver items she inherited from her mother (my grandmother) “Tui”. Tui was born in 1888.
This image is from the back of a hand mirror.
I would like to know what these marks mean, If possible.
Tui Mirror.jpg

The marks show that it was assayed in Birmingham in the assay year 1908/1909 and was made by Henry Matthews of Vittoria Street, Birmingham.