I found a pair of Valentino sandals in a thrift store and I am certain they are authentic. The size on the sole is 40 which normally equates to a US size 10. However, I am a size 7.5 / 8 and they fit me perfectly. Do Valentino shoes run extremely small? Or are these a vintage pair that had a different type of sizing? I plan to sell them and am not sure what size to put in the listing!