There are only four 'true originals' (from 1215) including this burnt one. Ross Perot owned a copy from 1297 - which is the version that is still considered part of English law in a technical sense (nearly all the provisions have been modified by later laws, but it's still 'on the books' as applying in any case where it wasn't modified.
So...the one I have from the late 1700’s isn’t worth much, eh?