Why the bloody hell MUST it exist?
Ian Heath didn’t design it. He, or his illustrator drew it. For a book. It is an artist’s impression of what a Uchelwyr might have looked like. At a certain point in time, certainly not across three centuries per your OP.
Ian Heath is not a sculptor/figure manufacturer. You understand this, oui?
"I go online sometimes, but everyone's spelling is really bad. It's... depressing."