Labels and files aren't quite the same thing in their application, and probably shouldn't be considered interchangeable.
Quote Originally Posted by Cygnus View Post
I actually noticed that Gayre stated as much in his book, my assumption that the file and the label were interchangeable came from some examples I'd seen where it had been used in this way (such as Romilly Squire of Rubislaw's book plate).
I suspect that Romilly's use of the file in this instance is based on purely artistic motives-- which is to be expected given that he is one of the world's top heraldic artists.