This is the same head mold as the standard/LE release MSD Ken and Mika. The default eye size is 16mm. Since it was part of a standard release sculpt, it was released to all locations initially. 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.