The aesthetics of this dress is very similar to those from Fall 2009. It could be something from that era, not everything is shown on the runway and there are scant records of Cruise and Pre-fall collections then so it’s really difficult to find information of one particular piece of ready to wear item. Hope it helps.
https://www.vogue.com/fashion-shows/fall-2009-ready-to-wear/valentino
https://www.vogue.com/fashion-shows/fall-2009-ready-to-wear/valentino