Here is a description of the major differences in the known obverse and reverse varieties.

Obverse:

1. Original obverse bore the date 1998.
2. Replaced the date with TRUST IN GOD.
3. Mint error on new die – no TRUST IN GOD.
4. TRUST IN GOD restored.
5. Large head and lettering – ‘E’ in liberty touches crown on both edges.
6. Head and lettering size reduced - deeply struck with flatter rim.
7. Shallow relief, wide rim, 'Crooked' GOD, short hair lock.
8. Shallow relief, wide rim, 'Straight' GOD, long hair lock.
9. 2007 date.

Reverse:

1. 1998 reverse.
2. 1999 reverse.
3. 2000 type I reverse.
4. 2000 type II reverse.
5. 2003 reverse.
6. 2004 $20 reverse - not released until 2006.
7. 2005 $10 reverse.
8. 2005 PUERTO RICO $10 reverse.
9. 2005 type I $20 reverse.
10. 2005 type II $20 reverse.
11. 2006 PUERTO RICO $20 reverse.
12. 2006 MICHIGAN reverse.

The major varieties use combinations of these obverse and reverse patterns as follows;

1. Obv 1, Rev 1  (semi scarce)
2. Obv 1, Rev 2  (scarce)
3. Obv 2, Rev 2  (common)
4. Obv 3, Rev 3  (scarce)
5. Obv 4, Rev 3  (unknown, may be scarce)
6. Obv 4, Rev 4  (common)
7. Obv 4, Rev 5  (common)
8. Obv 5, Rev 5  (semi scarce)
9. Obv 6, Rev 5  (scarce)
10. Obv 7, Rev 5  (common)
11. Obv 7, Rev 6  (scarce)
12. Obv 7, Rev 7  (common)
13. Obv 7, Rev 8  (scarce)
14. Obv 7, Rev 9  (semi scarce)
15. Obv 8, Rev 9  (unknown)
16. Obv 8, Rev 10 (unknown)