Originally Posted By AQM
I think you're right.

I managed to find Charles' signature which might be him emulating his predecessors:



From here:

http://www.morgan-motor.co.uk/sales/aero_supersports/ordering_information.html

And this (although it's a bad quality gif:



from here (scroll down):

http://www.kls2.com/~karl/cars/1953-morgan/


Great!

And I just remembered I've got, if I recall correctly, Peter Morgan's signature in a book at home... should take a look and see how those match up!