vintage Modernist reticulated sterling, bronze and tourmaline crystal bar brooch

Vintage handmade textural reticulated sterling silver and wire wrapped bronze brooch with a captured green tourmaline crystal. The brooch measures 3.5″ in length and is unsigned and unmarked however it tests sterling silver. It is Brutalist in design and is certainly one of a kind made by one of the modernist art jewelers. The pin mechanism works well.