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5 Reasons to Buy and Collect Certified and Graded Coins - By: Robert L. Taylor, JD, 2008-07-09 Why should a coin collector and investor buy and collect professionally graded and certified coins?. Commonly called “slabs”, they are housed in a protective plastic holder. There are many companies – over a dozen are less than 2 years old – which will put your coin in a slab after Certifying that it is Authentic, and assigning a Grade to the coin. COMMENTS Add a comment |