Hi to all the members in this forum once again.Here is a chinese centenary birth of chairman mao FDC with one unique edge on top right position but the rest of the three edges remain back as normal on this first day cover.Honestly,I have never never anything like this before as a collector and this is the first time that I have ever came across something like this for sure.Unfortunely,I really have no idea why the edge is unique just happened on this first day cover compare with the rest of the similar first day covers which I am having right now.
That is why I need help from the experts from the chinese stamp society to identify if this is considered as an unique edge or not and also a new discovery on the chinese first day cover and I also need the explanation of how did this happen on this first day cover which belong to me.
I hope to hear from the experts as soon as possible and your help is very much apprieiciated by me as usual.Please refer to the scans below and see carefully.Check it out and let me know what you think.Thank you.


