Egad, I am finding that this is a subject worthy of a doctoral research project. Things are decidedly label specific and even beyond the 1A, A-1 pressing codes, there is variation. I read where A-2, B-1, C-1, etc. may all be first "mother" pressings, depending on the expected initial demand for the recording. These were not really issues for me when I acquired the majority of my LP's because I bought most the minute they hit the shelves. Replacement in this latter day environment is quite a bit different.
Confusing, at best. Looks like you do the best you can and if it is an LP that is REALLY improtant to you, then you buy multiples and keep the one that sounds best..........
