So, what do all those letters and numbers mean? Another newbie and I thought it might be helpful if some of you experts would by gracious enough to pass on some of your knowledge in this area. On the label and in the dead wax there are codes. (For example, I’ve noticed many of my LZ records have “SD” followed by numbers in the upper half of the label, ST-A- followed by numbers beneath the track listings.) Anyone willing to give us a brief lesson on what these mean and more importantly what we should look for as vinyl collectors? Much thanks!