Originally posted by Tweetytunes: I think the coin idea was stupied as I have no idea what size a american coin is. I`ve been two time to the usa but both times all I really got was notes The U.S. quater is approximately 1 inch in diameter ( 1'.00 ). The U.S. penny is is just 25% smaller ( 0'.75 ). Sorry it's not in the metric system. I agree papalatistudios, I think the model should make a good impression.