Eliza, I have to admit that my only encounter with authentic Cornish pasties was in Cornwall in 1968, caravanning that summer with my parents. (The Nankivells originate in that part of the world.) Mom bought some without knowing what she was getting and served them for dessert assuming that they were fruit turnovers. Whoops! Looking at what Mr. Google has to offer, I don't think it'd bother me where the seam was, though I see the official specs are described here. :-)

~ Becky in Long Beach