ALE, on this watch I think each can be different due to the properties of the bronze and it's reaction to handling and just the atmosphere. If handled and in a humid environment, it can quickly generate a significant patina. However, an untouched model not on display, and not exposed much to the environment (i.e. boxed at Panerai and unboxed only at home with new owner) can look very bright with minimal or no patina. Once unboxed, this will change rapidly.
My point here is only that there is no need for maker to introduce any additional steps to generate patina, this will happen all by itself.