Many collectors are aware and have good knowledge about the replacement note nowadays. I came across these two replacement notes, retrieving from my kids "Ang Pau" or red packets during this CNY. It is normally a good times to scout for UNC replacement note during festival seasons. You will be surprise to see many of them just appear in the "Ang Pau" given to you or your kids.
I usually will keep these replacement notes for years, knowing the value of these notes will appreciate in future. The value of these notes can double or triple just in few years time. That's is my opinion and it normally does.