Help identifying small box

I am hoping someone can help with this little box.  The lid is the colour of pewter or possibly spelter.  The two birds are in relief, the inside of the box lid is pushed out but the other details seem to be cast somehow.  The edges are covered in a millegrain effect for the background then foliage seems to be cast,  It is really attractive.  The base of the box is coppered as is the interior.  The edges of the base of the box are mostly coppered.  The rim of the top is partly coppered.  On the base there is a couple of places where the copper is missing and it appears to be very dark metal with tiny holes, almost like volcanic rock does.  We are keen to find out as much as we can as it is such a lovely little thing.  At first glance it doesnt look much but the closer we look the better it looks.

Poor