A couple of observations.
The A1/B1 matrices are used on some UK, Ireland and Portugal pressings. Only the Irish pressing does not have the country of origin on the label - according to Discogs.
I have A2/B2, A3/B3, A4/B1 and A1/B1 UK pressings, A1/B1 Portuguese pressing and an SD 19130 RL PR USA pressing. In my opinion, the UK A1/B1 pressing is easily the best and, currently, probably the hardest to find and the most expensive. You cannot say that about many 4th pressings!
Does anybody know who was responsible for the A4 FOR MARY pressing; I've looked everywhere, to no avail.
My Portuguese pressing is the only issue I've come across with the catalogue number printed on the rear sleeve.
I'm still looking for the Irish A1/B1 pressing.