**I've seen some Goddess cels around, and wanted 
to know if all the PRODUCTIon cels have cel 
sequence #s?**

As far as I know, all the production cels should 
have sequence numbers (but it's an easy matter to 
remove them with a solvent such as ethanol, 
although I don't know why someone would do 
that).  On the other hand, many of the OVA 
reproduction cels also have some numbering on 
them, and even if they didn't, it's easy enough 
for someone to add them with a marking pen.  
Typically the only way to be fairly certain that 
an AMG OVA cel is a production cel is to compare 
it to the source material (and even then the 
differences can sometimes be hard to detect).  It 
helps to purchase cels from a seller who is 
knowledgeable.  So far, all cels from the AMG 
movie appear to be production cels.  

**Also do they have a stamp on them that says AIC?
What does the stamp mean? IS it still a 
production cel?**

In recent years, AIC has stamped many of the cels 
from its series, I guess to indicate that they 
are authentic (although I have an El Hazard cel 
that did not appear in the video that has an AIC 
stamp).  The studio released most of the AMG OVA 
cels before it started using the stamp, but some 
do have it (I have a couple of stamped cels).  
Many of the AMG movie cels have the stamp, but 
many don't.  I'm pretty sure that some of the 
unstamped movie cels walked out of the studio 
through means that were not sanctioned by the 
studio.  It's also possible that AIC just doesn't 
bother stamping all the cels.