Like new, women's size 39-40 (9-9.5 US size) Dansko sandals that were custom modified for a leg length difference. These are designed for someone whose right leg is 3/4" (or more) shorter than their left leg (see second photo). The shoemaker did a fantastic job, but made them too short for me - they have therefore never been worn.
In all, this is about a $350 for free (cost of sandals and custom modification). I was never able to wear them, but I know how challenging it is to wear sandals when you have a leg-length difference and I hope they can go to someone who can!