The Unown Z (72 / 132) card can be found in the Secret Wonders set.
Recently sold 1 times and based on those sales is worth around £4.14.
Currently, there is 1 open listing for this card on ebay.
This card sells in the range of £4.14 to £4.14, making it very stable.
This Uncommon card was illustrated by Kazuyuki Kano.