Question from Aoife - Signature of an heir apparent

Hello, how would an heir apparent sign his signature in a letter, like for Henry VIII, his signature would have been "Henry R", and for his son Henry FitzRoy as the duke of Richmond, he wrote his signature as "H Richmond". Would Arthur have written his signature as "A Wales" or would it have been "Arthur W" or would he and Edward VI have written their signatures another way as their father's heir apparents?