I am late to the party, but I thought I should reply in case my 2 cents are useful (probably not).
it looks exactly like the clay hibachi cooker I bought years ago from an importer of pachinko machines (markings, color, clay feet, cradle, hinges, clay top, metal top etc.). I believe they were intended to be kamado knockoffs.
It worked well for low heat applications but cracked very easily once the heat got to 400. I would nt grill on it if I were you, but any kind of bird will come out better that you can achieve on a grill, offset, pellet, drum etc.
I ultimately got rid of mine because it cracked more than once and I learned about the ceramic units.
It looks like you did a great restoration job.