Acetates and Test Pressings
Before the advent of formats other than vinyl records, a type of promo surfaced known as an "acetate". These records were made of a cheaper and lower quality acetate vinyl. They were generally made in very low quantity and often had hand-written labels. Frequently they were only a test pressing, and thus were called "promo acetate test pressings".
Read more about this topic: Promotional Recording
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—Samuel Richardson (1689–1761)