The Quality Collectible Coins Proxy coin is now available in the following size diameters:

18 mm for US Dimes and some small gold pieces.

19 mm for US Small Cents, including Flying Eagle, Indian, and Lincoln.

24 mm for US Quarters and1795-1829 $5 Gold pieces.

29 mm for US Large Cents and Half Dollars.

38.1 mm for US Seated, Morgan, Peace, and Eisenhower dollars.