Thanks mate.
I guess there is no hard and fast rule on the Pre As as its widely reported Richemont used what was left over from the OP buyout. Assuming that, I assume you can end up with a lot of variations to individual models possibly even individual watches.
For example I suppose, in the same way the 26 transitional model is A/B series but was issued in the same batch as the full B series Although of the 500 26Bs 50 of them are the transitional A/B version.