It's the older model of this Char-Griller:
The firebox they sell now is completely different than the one mine come with, but I got mine about 15-20 years ago.
I have just about decided that rather than spend much money on it, I am going to just build a UDS and keep this for grilling. It still does good at that. I wish I could go out and buy a new smoker, but with 2 kids in college, thats not going to happen for a couple more years.