Whilst Digging in my back yard....

I unearthed this small compact that inside was still shiny gold plate but the outside was totally green. The whole box was initialy green from corosion. After some brief dusting off I noticed the engraving on the lid. After a bit more cleaning I managed to free the hinge and it popped open.
Inside was an old mirror that had seen better days.
Any and all comments sugjestions or questions? Please feel free to reply.

John.