Is there a hardware variant of AES called AES-0? I do not know if this is a zero or the letter o but I saw a machine with this written on it last week and I have been wondering ever since.
The old belief used to be that the Neo-O were the original systems. But some that have NEO-O and have higher serial numbers. NOW, it does depend on the box.
I've also heard that Neo-O means that the systems are JApanese, while the Neo-AEC
But honestly, unless it is on the box (the more rare boxes), I am not sure if it has any bearing on the system price or not. A neo aes is a neo aes though
I did try looking up some info for you, but most of it is confusing and lead to no decisive conclusion.
I hope this helps.... and sorry I don't have more of a definitive answer for you.