Clashes themselves aren't that rare, but it's almost always the obverse and reverse of a single coin type. The rarity is that there are only six verified off-center and six verified multi-denominational clashes in all of 19th century
US coinage history, most of them with FE -
http://www.kevinjflynn.com/books/th...ed-die-book/
-----Burton
50+ year / Life / Emeritus
ANA member (joined 12/1/1973)
Life member: Numismatics International, CONECA
Member: TNA, FtWCC, NETCC, EveryCountry (online) coin club
Owned by three cats and a wife of 40+ years (joined 1983)
Author: 3rd Edition of the Sample Slabs book,
https://www.sampleslabs.info/