WW1 Hallmarked Silver & Tortoiseshell Royal Flying Corps Sweetheart Brooch

This super WW1 period Royal Flying Corps sweetheart brooch has a fully hallmarked silver surround, it carries the date for London 1916 and has the makers mark for Corke brothers & Co, the central silver is set into a disc of tortoiseshell and in its day would have been an expensive private purchase, sadly the shell chipped around the edge but the silver and the pin are in good condition, it measures just over one inch in diameter.