With no exceptions that I can think of, Czechoslovakian specimen banknotes from the pre-world war II era have been selling for much more than catalog value. The most common banknotes of this type that are found on eBay are from the 1926-1934 issue as issued by the Czechoslovak National Bank. Pick 24, the 500 Korun banknote, and pick 25, the 1000 Korun banknote are most common. Specimens of these banknotes are valued at $15 and $20, respectively, in uncirculated condition. However, I feel very lucky to have won an auction on a very fine conditioned 24s for a price of $9.05, as I have seen these banknotes sell for over their UNC catalog values even in conditions as low as F. Here’s my winner:

Czech pick 24s: 500 Korun from 1929 (Specimen)