Divineblue

I found a mirror in the back of my cupboard and I am going to give it a good clean and possibly reframe it as the mirror itself is in lovely condition apart from some dust. I just wondered if anybody could give me any information about the mirror as it has the old chelsea lion and the writing looks old too. Any information at all really is appreciated like the possible date of release? Does it hold any value? etc. Thankyou in advance fellow Blues.