It's a Happy Cooker? How can you tell?
It looks like it has a ridge to support the grate. I think that's just grease marks in the ash coating the inside of the cooker. I also see tabs to support the cooking grate. I think it's a Weber.
That "ridge" you see down in the lower part, not up at cook grate level, is actually a removeable ring / ash pan.....if you look close, on the right hand side in the one pic (3rd), you can see the row of holes that face toward the inside of the kettle....
It's all one piece, ash pan / airflow diffuser of some sort........
H / C's have bottom vents that are almost like Weber.....the top vent has NO Weber i.d. on it, the triangles are almost identical ( probably why some folks love them so much....) wheels are a lot alike, etc., etc.......
Hoppy Hooker......