The Unown V (177 / 195) card can be found in the Silver Tempest set.
Recently sold 11 times and based on those sales is worth around £24.00.
Currently, there are 11 open listings for this card on ebay.
This card sells in the range of £20.11 to £27.89, making it stable.
This is a Rare Ultra card.
The fact that it is a V card makes it one of the more valuable cards.