Gold Cameo Brooch

by Sue Jackson
(Exeter,Devon UK.)

I have a gold cameo brooch,with EJ.Cy (y,underlined) & Co. 4 boxes containing the following;9,-375,sideways anchor, P.

Lady on Cameo is wearing a necklace.
I have had this brooch for a number of years.
Can you give me any info on this item, please.