The Mew (19 / 165) card can be found in the Expedition Base Set set.
Recently sold 7 times and based on those sales is worth around £137.81.
Currently, there are 2 open listings for this card on ebay.
This card sells in the range of £110.71 to £164.91, making it highly volatile.
This Rare Holo card was illustrated by Hajime Kusajima.