Here you'll find the answer:

http://standardvinyl.com/vinyl-pressing/lacquers-masters/

http://www.youtube.com/watch?v=ZbTPKCtdhSA






Message: 2
Date: Sun, 6 Oct 2013 00:22:59 +0100 (BST)
From: Steve Watson <steve.watson27@btinternet.com>
To: "klf@mailman.xmission.com" <klf@mailman.xmission.com>
Subject: [KLF] Stampers and acetates!
Message-ID:
        <1381015379.21355.YahooMailNeo@web186005.mail.ir2.yahoo.com>
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I guess an acetate is a raw trial of a disc or CD to check for quality but I haven't a clue what a "stamper" is! Maybe someone could enlighten me? In ther meantime a big thanks go to members of the list who have helped me fill the gaps in my KLF collection with good quality copies of Lost Sounds Vol 2 and The White Room rather than dodgy fuzzy ebay copies!? You know who you are and I thank you again...but I still don't know what a "stamper" is!
?
S