Don't for get there are mule clashes as well, and these bring a considerable amount more money. Mule Clashed = Clashed with another denomination. The FE have
Seated quarter and $20.00 Gold clashes, the 2¢ piece with the
Indian cent of 1864, but an
IHC with a 2¢ piece clash has never been found, yet!
Clashed coins are almost a subset of collecting in itself, see
http://www.maddieclashes.com for a bunch more info on clashes.
"Buy the Book Before You Buy the Coin" - Aaron R. Feldman - "And read it" - Me 2013!
ANA Life Member #3288 in good standing since 1981, ANS, Early American Coppers Member (EAC), Colonial Coin Collectors Club member (C4), Conder Token Collector Club member (CTCC), Civil War Token Society (CWTS) member, Liberty Seated Collectors Club (LSCC) & Numismatic Bibliomania Society member (NBS), USMex, Member in good standing, 2¢ variety collector.
See my want page:
http://goccf.com/t/140440