I probably don't see your requirement.
If you never intend to open it up, why would you care?
Just out of interest. And if it is a revision that can be easily expanded to 1 MB chip RAM onboard, I might decide to open it.
Just what are you getting at here? How many machines do you have? 
6 or 7 (I think).
Oh no, I just opened up and repaired my Amiga 500, does that mean I lost my warranty with Commodore?
Yes, it's wothless now. Better give it to me.

Gee wiz! This is a tuff thread.
Sorry for starting this...
