Chasing the unicorn TBC-3000 4th gen?
 

I'm not in a place to purchase one right now, but I want to be ready to strike when I, myself, am financially ready.

I'm wondering how to know what generation a TBC-3000 is? How can you tell? I know you can't tell externally, and you need to look at the board inside. Are there dates that determine the generation? Or any other specific details on the board that give it away?

If any of you can point me in the right direction that would be awesome. Also, if you have picture examples that will be even better.

Thank you for your time.