1820 is one of the keys in this series. It has the third lowest mintage of the series even when the overdate is included. I posted an overdate earlier in the thread but would like to add an 1820 O-103,Sorry the color balance on these pics is off, they are old pics. The coin has a nice color.This marriage utilizes Obverse die 3 and Reverse die CThe date is punched low and the 2 has a small curled base and a small curled top while the 0 is large.The reverse shows narrow A's that have small serifs at the base.While it may be a little hard to see in my pics, the second T in STATES has been punched over first attempt after it was punched in too low.