Vintage Brassy Gold butterfly necklace

POSSIBLY brass? Or, gold plated brass? Or gold plated unknown metal.. idk regardless of what metal it is.. this is such a beautiful necklace. Good quality & doesn’t turn my neck green or cause any sensitivity issues! it has been re-worked. You can see in the photo that a jeweler soldered the butterfly back to the chain.. slightly off-set… but it’s absolutely adorable & is perfect for layering necklaces