And by tea set, do you mean a nice cup and saucer? Or are there more pieces? This is nice quality stuff, not a lot on the web, I agree. And it says Occupied Japan? That can add to the value.
Guestimating, based on current and past searches, a cup/saucer set can be $25.00. The occupied Japan may add value.
Since there's so little Web info re: your brand, perhaps you could google for -- made in occupied Japan tea set --.
Best wishes, KB