Cels Forum

I've got a cel of Kyosuke Shingure from 
Voltage Fighter Gowcaizer, and I think
it's a key cel, but I'm not to sure.
In the upper right hand corner the
number is A1, does this mean it's a 
key cel?
I've also got another that has a 
number of B4, what does that mean?
Can anyone help me on this? I'm
really interested to know.

Cheers =)

Megan.