These vintage 1980s Italian black leather over-the-knee boots by Mary Popps sold for a very impressive $237.50, especially in a small size 6.5 I'm not so sure about the red piping but I really like the 30" height, nice cuffs, straight lines, and sexy spiked heels.
I think these fetched such a high price because these boots very rarely appear on eBay. They also appear to be in excellent condition!