What happen to this china 10c banknotes 1979?constant varieties or plate flaw?

I am a chinese note collector and have been collecting chinese notes for many years,especially the chinese old notes.Accidently,i discovered this chinese consercutive running number 10c notes with a "y" showing on upper right and a "dot" on the left center of each of this notes.What happen to all this notes with this varieties????are they considered as constant varieties or plate flaw?????is this normal and common things on chinese notes????Need help from the banknotes expert please and explain in detail,help is always apprieiciated,have a nice day.:hug:

 

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i am by no means an expert, and can offer little to answer your question. Hopefully one of our members from that part of the world can answer. just throwing out a possibility, but being that the Y and dot are on all the notes in the same spot... can it be they might just be check characters for cutting?

 

Daggarjon, I was thinking the same thing, check characters for cutting. It so happens that I do have a 10 Fen note just like this one serial number
ZW 439948. Did a check on my note with a magnifying glass and the y and dot are note on my note.

Lou

 

Well, that was my only guess also, the 'y' almost looks like it could be a '9' with the top half of the top loop cut off. Not that it makes much of a difference.... still not sure what it is.