There are two different C flaws available on number 14.
14vii listed in Unitrade is presented here as a plate proof pair with the Q-flaw 14iv. The left stamp in the pair is the C flaw:

An uncatalogued c flaw is listed by Whitworth as his flaw number 14. This is the only copy of this flaw I have seen. There are two diagonal marks in the C of CENT.
