Cartier key holder. I purchased it about 10 years ago at a store in Sydney Airport. I don't have the box, but it is definitely authentic. I think it can still be used. Cartier Key Ring Key Holder Bag Charm C Heart Color: Silver Size: Total length approx. 6.6cm, charm height approx. 2.5cm, charm width approx. 3.1cm, thickness approx. 0.4cm