Up for sale are a used pair of AKG K550s. They sound great and are fantastic as a cheaper monitoring-style headphone. Closed-back; all the reviews online confirm that these guys sound fantastic and are great value of money. Many 5* and top level reviews available.
These are priced to sell - PM me for any other details. Can be shipped with expedited service at a small additional cost.
N.B. No box/receipt with these guys