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Probably late 1990's. The serial numbers were usually one letter followed by five numbers, at least through 1991. But by the late 1990's Colt was using two or three letters followed by four or five digits. Colt also used a two letter prefix during 1980 as well, the prefixes, as far as I know, are AL and VA. Most of this late year info is based upon observations of internet posts.
 
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