Thank you for answering my question.
Considering everything is easy to fake, how 
can I know it's real production cel? I wish I 
knew enough of anime cels. I just started 
collecting cels, so don't know how to decide 
fake/repro/production cels.
I think in this forum there are so many experts 
who are kind enough to give me a piece of 
their experience how to decide 
repro/fake/production cels.