I think that not studying die wear and faults on bronze strikings carried out by Heaton before 1860 is a mistake.
The die variations and reasons behind them may well be more easily explained if earlier foreign bronze coinage was studied to the extent
that bronze UK pennies and halfpennies 1860-63 have been.....
I did try with the app - direct from the link on the faulty website - but was told that both my android devices were both incompatible. Even though my tablet and phone are less than a year old. Virtually new.
Not good.