Cels Forum

Sometime the number is written on an extra strip
of plastic taped to the rest of the cel. This strip
may have been removed latter. (That's not uncommon
with large cel or when the whole plastic sheet area
was needed to paint the cel).

Also, the number may having erased later : just putting
your fingers on it may remove it. When you clean the
cel, it's quite easy to erase the number if you are
not careful.

Cheers,
Yann Stettler