There's hope!!!

I have a cel or two that is number less [or 
without holes].  It doesn't mean that they're 
fakes or reproductions. It might just mean the cel 
was a pan cel.  They're not always marked A1 END 
[although they should be].  Your cel is gorgeous. 
^_^  If anything else, it might just be a special 
one done for that book.  I'd check the series, 
ask everyone you know [who did you buy it from? 
where did they get it?  etcetc].  Goodluck!

Does the sketch have any other markings besides 
lacking a number?  Scan the sketch and show it, 
that might help!

Van