A serial number 1 10-dollar demand note sold at auction in 2014 for $381,875. Very rare, the 1878 silver certificate is a huge deal with collectors. Only four are known to exist in good condition ...

The value of an 1878 S Liberty Seated Half Dollar in average condition is about $18,897, according to CoinTrackers.com — but one in mint condition could go for as much as $115,000. CoinTrackers ...