This is an acrylic stand that was sold on the artist's Booth on October 5, 2022, to commemorate their 1st anniversary. (Before they joined Reject) The Booth page is no longer available, and I haven't been able to find anyone else mentioning this acrylic stand in my searches, so I believe it's a rare item. For reference, the product name in the Booth purchase history was "[1st Anniversary] URS-No.1005 Acrylic Stand ~Limited ver.~ [Limited Time] (Acrylic Figure-M (100x100mm))". *I can also show you a screenshot of the Booth purchase history if you wish.*