A number of interesting patterns occur for several of the Clark, Gruber & Co. gold coins.  Some appear to be contemporary pieces, others appear to be more modern concoctions using the original dies.  Determining the difference is difficult and subject to debate.  Where possible, we present as many the positions of which we are aware.

1860 2-1/2 Dollars in Copper 
1860 Five Dollars in Copper 
1860 Ten Dollars in Copper 
1860 Twenty Dollars in Silver (Silver-plated Copper?) 
1860 Twenty Dollars in Copper 
1860 Twenty Dollars in Copper (Uniface, Reeded Edge) 
1860 Twenty Dollars in Copper (Uniface, Plain Edge)
1860 Twenty Dollars in Gilt Copper 
1860 Twenty Dollars in White Metal 
1860 Twenty Dollars in White Metal (Uniface) 
1861 2-1/2 Dollars in Copper (Plain Edge) 
1861 2-1/2 Dollars in Copper (Reeded Edge) 
1861 Five Dollars in White Metal (Plain Edge) 
1861 Five Dollars in White Metal (Reeded Edge) 
1861 Five Dollars in Copper (Plain Edge) 
1861 Five Dollars in Copper (Reeded Edge) 
1861 Ten Dollars in White Metal 
1861 Ten Dollars in Copper (Plain Edge) 
1861 Ten Dollars in Copper (Reeded Edge) 
1861 Ten Dollars in Copper (Struck over an 1849 Large Cent) 
1861 Twenty Dollars in White Metal 
1861 Twenty Dollars in Nickel 
1861 Twenty Dollars in Copper (Plain Edge) 
1861 Twenty Dollars in Copper (Reeded Edge) 
1861 Twenty Dollars in Gold (struck over a U.S. 1857-S Double Eagle) 
1861 Twenty Dollars in Gold (struck over a U.S. 1845 Half Eagle) 
1861 Twenty Dollars in Gold (struck over an 1853 U.S. Assay Office Twenty Dollars)

Images courtesy of Superior Galleries

Sources and/or recommended reading:
"Walter Breen's Complete Encyclopedia Of U.S. And Colonial Coins" by Walter Breen

"Private Gold Coins and Patterns of the United States" by Donald H. Kagin