Chester Hallmark gold; unsure of date

[populous38]

Hi Guys.
This is a little broach. 9ct Gold with green stones, which i think may be little emeralds + a small diamond in the middle.
The broach has Chester hallmarks but I can't work out the date letter. Any pointers will be greatly appreciated as always.
Gary

[silvermakersmarks]

The date letter looks like "E" for 1905/06/

Phil

[populous38]

Phil,
excellent. your help is always appreciated. Cheers. Gary