You may discover three members of which kingdom from the stamps?
This might not be the right approach, but here's a possible interpretation of the first two:
Six=VI, P, Queen=ER (Elizabeth Regina=Queen Elizabeth): VIPER (snake)
10=TEN, Helvetica=CH (ISO Country code for Switzerland): TENCH (fish)
Haven't found something similar for the third stamp yet. But these seem more rebus-y to me...
Anyway, as others have found this makes the kingdom the
Here's a guess for the third stamp (not super happy with it):
101 (squinting at the two vertical borders and the round one in the middle)=CI; Hermes=VET: CIVET.
Here's a second guess for the third stamp that I have a feeling is right in the sense that it's a Dad joke/bad wordplay.
Hermes = Pan Dad. But's it is only his head, so it is PANDA...
Since this asking the kingdom, perhaps the kingdom is
The first stamp is a picture of Queen Elizabeth = Britain.
The second stamp has the word Helvetia, which is some kind of spider or a female personification of Switzerland = Switzerland.
The last stamp seems to be a picture of Hermes = Greece