This one has an extremely rare binary serial number (9s and 0s only), note the CA18 is the prefix (18 = the year of printing, 2018) only. All photos in this listing are of the actual note you will receive. The reserve bank has stated that only about 11.5 % of the notes from the bad run are in circulation (as of May 2019). The error notes remain legal tender in Australia, while the numismatic blunder will make these valuable to the error note collector.International buyers: item to be sent with tracking. Australian buyers: item to be sent with tracking. The item "RARE BINARY SERIAL Australian $50 Note Spelling Error CA180999009" is in sale since Monday, May 13, 2019. This item is in the category "Coins\Notes\Australian". The seller is "ghoul7210" and is located in St Helens, TAS. This item can be shipped worldwide.