Beautiful airmail set. Nice add to your collection. Enjoy!The faces of these stamps are pristine.The gum has cracks and has absorbed some black particles possibly from the mounts-see scansI have looked at the backs with everything but a microscope and I see no hinge marks. Again look at the scans. The stamps are being sold as you see them in the scans. The bidding is starting high because I don't want to give these away.Please see my other itemsI combine shipping.