RM1.00 prefix YN0010023

A few months ago, I was cleaning my son's room and found some 'ang pow' packet. Before I throw, I checked whether or not there is money in it and as I guessed, I found this fancy number of RM1.00. Looked more closely, a small error like a dot on the top right of the obverse note. I could only smile and told my son, I will keep it.