I have had the following info back form Kiyoaki Ozaki in Japan:
Thank you for your information.
We are sure that the ring is one of Japanese!
But so far we cannot find the banding data.
Maybe it is newly banded and still not reported the banding data.
Please wait a moment for the exciting news!
Best regards,
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Kiyoaki OZAKI
Bird Migration Research Center
Yamashina Institute for Ornithology