Vintage MCM Unsigned Peacock Rhinestone best Brooch Possibly Sphinx

After much research, I am unable to decide the maker of this magnificent Peacock brooch. It is unsigned so it makes it very difficult! It is of high quality in gold tone metal with green glass Cabochons on the feathers and a blue stone composing the birds body. The head of the Peacock is a brilliant Cobalt enamel. No missing stones and the clasp works well. I could be best made by Sphinx as after research, they made this piece for outside markets and did not mark them. FREE SHIPPING