Model 2 is the version with round buttons, not oval.
The only catch is I'm looking for a certain board version. Browsing online, it looks like you might be able to tell by looking at the bottom of the console, according to this thread.
http://segaxtreme.net/community/topi...ally-possible/
The one I'm looking for is the 32 pin version, the one where you don't see nearly as much of the shielding.
Thanks! I have lots to trade so if you're looking for something let me know.