Save yourself from frustration and e-mail you do 
not want to answer.  Explain what the water mark 
in the item description, easy enough!

Being and anime fan and stepping from pencil 
boards to cels is a scary venture.  Especially 
when you see the prices everywhere.  I doubt' any 
of these people would consider spending $400.00 
without some thought.  So questions not so stupid.

There are definitions to cels and the numbering, 
if they are key ect.to be found, but even a new 
person who would be a serious collector can apply 
this rule to what they see only for sale, and 
then spend hard earned bucks on it.

The seller knows the most about the cel. Fill the 
prespective buyer in!  The condition of the cel 
and its number. Pencil yes or no.  And please 
explain the water mark.  The more you tell the 
less e-mail.

Trying to save both parties the grief! :-)