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People who buy LPs on the used record market are concerned about which copy of the record they might get. Some people want one of the first pressings. (There are a lot of reasons why collectors care about such things, but you'll have to ask one of them why.) The matrix numbers on any record are stamped in the shiny vinyl between the last groove and the label, a different number on each side. Every time a new master is cut from the tape recording, the ending number is new but the matrix number stays the same. For example, I'm holding an RCA Victor LP. Side 1 is stamped K2RY 4061 - 5S. Side 2 is stamped K2RY 4062 - 3S. This is a later pressing than - 1S on both sides would be. (Another company would use - 1A instead of - 1S.) If a dealer is offering an LP that has - 1A on both sides, someone might pay extra to get it. He would describe it as 1A1A matrix ending.

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Q: What does 1A1A matrix ending mean on LP recordings?
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