A stunning vintage modernist brooch, with two curved halves and some swooping lines. Circa 1960s-1970s. It is hallmarked '830S' (Scandinavian grade silver, from Norway, Sweden, Denmark or Finland) along with a maker's logo - something like an H within a round circle. Unidentified maker, see pictures.
The two flat curved shapes have fine line textures and cutout slits, the adjoining curved lines are bar like. One surface has a silver ball - all typically mid century abstract and from the Scandi region.
39mm long x 28mm wide. Weighs 4.6 grams. Roll over pin to the reverse. Very good shiny wearable and presentable condition. Stylish, vintage and nicely made. Perfect gift idea. 
Price includes P&P to the UK, and presentation box.