Further to that a lot of albums, have a limited run mastered by masterdisk before the main run. Masterdisks tend to have a better sound especially ones master by robert ludwig. the are some other companies used for such things, quite often batches go to strawberry for mastering for a limited run, also some strawberry mastered records are half speed mastered for better sound quality.
it all depends on the album really. Check deadwax for pressing numbers and mastering house used, sometime `the mastering engineer will signor stam`p the disk.
its all part of the game!
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