The $5 1834 Proof Classic Head Half Eagle is exceedingly rare. Most experts agree that less than a dozen exist but most estimates are that about half a dozen are known today. No Mint records exist of these coins being struck. However, in 1834 the U.S. Mint stuck at least 2 coin sets which included the $5 1834 Proofs to present as gifts to two different world leaders. therefore, any example in any condition is very rare. These are just some extraordinary coins to say the least.