Please be careful when you received $50 notes from anyone. Please read on.... Please also let your friends know.

MAS: Notes with 'KF' marking have no value. The Money Authority of Singapore (MAS) says the $50 notes with the letters 'KF' marked on them are considered to be deliberately mutilated and they command no value. This reply came in response to a feedback from Lee, who said he withdrew several $50 notes from OCBC Compass Point, of which three had the letters 'KF' printed on them. When he consulted the bank about the notes, he was told that there was no problem with the notes.

However, MAS says the letters 'KF', which appear to be marking stamped onto the note, are not part of the design of the $50 note. It advises the public who receive the notes with the 'KF' marking to bring them back to the banks for one-for-one exchange.

This is the reply from the MAS in full: 'The letters 'KF', which appear to be marking stamped onto the note, are not part of the design of the $50 note. 'Notes with such marking are considered to be deliberate mutilation and they command no value. 'We advise members of public who receive notes with the 'KF' marking to bring them to the banks for one-for-one exchange.'