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In page Collectable:

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The 1960s through the early 1990s were major years for the manufacturing of contemporary collectables. While some individuals purchased contemporary collectables to enjoy and use, many purchased them as investments. Speculative markets developed for many of these pieces. Because so many people bought for investment purposes, duplicates are common. And although many collectables were labeled as "limited editions", the actual number of items produced was very large. Consequently, there is very little demand for many (but not all) items produced during this time period, and their market values are often low.[citation needed]