Coins are a valuable, applicable subject to understand at an early age. This resource can be used as a poster (you can print at Kinkos or another printing company and use it every year!), paper size around the classroom, or even desk tags for individual support.
My students use this as a resource as a reference during the Money unit which builds independence and helps students self-correct as necessary. The visuals help students compare coins and the relevant information about each coin is color coded and easy-to-read.