Model is a size 9 (19 mm diameter). Every .4mm is half a ring size (9.5 ring size = 19.4 mm diameter). Measure the diameter of the finger you want it on and scale accordingly. No supports needed if printed with the emblem facing down.
https://www.tiktok.com/@rshomnic/video/6994298065049980165?lang=en&is_copy_url=1&is_from_webapp=v1
The author hasn't provided the model origin yet.