Vintage Enamel Butterfly Brooch Peking Jewelry

Condition is good - a bit of verdigris starting on backs but could be remedied - between 1.5"-1.75" tall - 4 butterfly brooches that was once a set of 12 in original case - beautiful well done enameling on gold tone metal - nicely made and not lightweight - hard to find and whole set sells for about $600 when it turns up - true vintage Goldtone, cloisonne, pin