Large Rhinestone Butterfly Brooch Vintage Swarovski?

Magnificent vintage butterfly brooch featuring large bezel set mogul style rhinestones in bright gemlike colors. They're sprinkled among pave clear rhinestones in silvertone plating against the goldtone base metal for a beautiful contrast. This looks like Swarovski butterfly brooches I've seen online, but it has what seems to be a maker's mark on back that isn't clear, as shown. Great vintage condition and eye-catching large size, at 2 3/4" x 2 1/2". Just gorgeous!