I realise that this is a well discussed topic and I have read most of the threads on this subject with interest but there is one detail that I haven't clearly understood and I am sure someone will know.

The early badges seem to be quite 'flat' in comparison to the later badges and certainly many of the replicas.

I think, but am not 100% sure that the 356 badge is quite flat.

Does any one know if there was a change in profile and when?

Thanks