:::: This is an unfair standard of proof given that so many Heirs Apparent will have been created Prince of Wales in infancy, or, if they were adults before becoming Heir Apparent, in some cases within days of becoming Heir Apparent. The periods involved are apt to be very brief and so not ones in which many letters are written, or are periods when the person in question has not yet learned how to write. As to "occasionally mentioned as", well, the sources are not occasional but unanimous. All agree that the badge is the badge of anyone who is Prince of Wales (as must be the case). But of all of the sources who speak further than that and comment specifically as to whether this badge is or is not also the badge of anyone who is Heir Apparent who is not yet Prince of Wales, ALL OF THEM that expand their thoughts sufficiently to consider that possibility do agree, unanimously, that the badge belongs to an Heir Apparent who is not yet Prince of Wales. Every one of them. And there is not one single source that refers to the badge as belonging to the Prince of Wales and then further asserts that it did OT belong to him UNTIL he was Prince of Wales. Not one.  Christopher L. Simpson