If it is any help, the cast iron flywheels on my NH have the 'qualcast' logo on them.
I think at some point in time Ariel dropped the forged flywheels for the NH and they all became cast.
AOMCC Member 4296
1950 Rigid Ariel VH
1951 Rigid Ariel NH (under construction)
1973 Norton 850 Commando Interstate