I like to collect these when I can find them. Here are a couple examples from this year: 1) 1.5 penny, from UK, mostly for use in Ceylon as it's halfway between the Dutch 4 Stuivers and the British 3 pence. 2) Colombia 2.5 centavos. I guess they still liked dividing things into quarters and eighths even after decimalization. Please share any other examples of interesting denominations if you care to!