This is the same head mold as the standard release MSD girls Sakura, Maggie and Myu. The default eye size is 16mm. Since it was a standard model, it was released to all locations originally. On September 30th, 2020 it became Tenshi no Sato and Mado exclusive. It became discontinued on January 31st, 2022.
Please click on the individual thumbnails to see the pictures full-sized.