This is a charming vintage pin or brooch in the form of a guitar made of delicate silver filigree with a gold wash. It is marked 800 for a grade of silver lower than sterling and is most likely Italian in origin. It fastens with a trombone catch.
It measures about 2 1/4 inches long and it is about 3/4 inch wide at the widest point. It is in very nice condition with some light surface wear. The pin stem is a bit bent but functions normally.