There is very difficult to read writing on the reverse. I can make out a NSW town and a name but I have not been able to ID. Very well made in 9ct gold.The markings or symbols (unicorn'9' and'W') indicate the maker is Willis & Sons (Melbourne). I have dated the item due to the gold markings, its post 1912 as the emu leg is down and the maker which stopped manufacturing items in 1931. The rear pin is missing. The brooch measures 3.5 x 4 cm and weighs 4.37 grams. The item "WWI Australian Sweetheart Brooch Antique 9 Carat Gold Willis & Sons Melbourne" is in sale since Thursday, January 21, 2021. This item is in the category "Collectables\Militaria\1914 - 1918 (WWI)". The seller is "historylover1980" and is located in Parkes, New South Wales. This item can be shipped worldwide.