Collecting error notes is much tougher than coins, since error notes are rarer and harder to find in best condition. One of the best error notes that have been acquired recently through this site is from the Marcos Ang Bagong Lipunan (New Society Series). Such error note is truly phenomenal because of the sequence of errors and the extremely rare combination of probabilities that occurred.
Foremost, the note that is a combinations of letter and asterisks prefixes, is extremely rare and has been unique only with the Marcos Ang Bagong Lipunan series. Second, the note was miscut, which resulted to a mismatched serial number. Thus, making it as one of the best error note that have ever appeared recently.