Sorry but AMG OAVs were produced well before
AIC started to put their logo on the cels.
Also, at that time they were still giving matching 
sketches with some of their cels.

The problem with AMG cels is that AIC made many 
promotional ones based on production cels from the 
anime. Those cels were done by the studio, nearly 
at the same time as the anime. So they use the 
same material and technics. And they are as old as 
production cels.

Why "shocked" by tape ? It's often used to keep
two layers together. Or fix a cut in the plastic
sheet.

Cheers,
Yann Stettler