This is the Astrotec Archimedes ATS-01. It features a 14.8mm large-diameter planar magnetic driver + a 9-layer piezoelectric ceramic driver. Purchased in August of this year, it has been used indoors for a few hours. There is a slight scratch on the right faceplate that appears depending on the light (see photo 5). There are white marks on both pin insertion points, but it seems to be present on others as well, so it appears to be from the manufacturing process (see photo 3). Otherwise, it is in beautiful condition with no scratches, stains, or signs of use. It works perfectly, and all accessories are included. The ear tips are unused.