Coach didn't start using "Style Numbers" with the "Month, Year and Plant Code prefix" until 1994. Therefore there is no "year code" for 1991. Any bag made in 1991 would have one of the older "7 digit serial numbers".
Hyacinth's Post #34 will explain.
http://forum.purseblog.com/coach-shopping/answers-to-authenticity-questions-94198-3.html#post1944848
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I see, thanks!