"In 1977, Gibson introduced the serial numbering system in use until 2006.An eight-digit number on the back shows the date when the instrument was produced, where it was produced, and its order of production that day (e.g., first instrument stamped that day, second, etc.). As of 2006, the company used seven serial number systems, making it difficult to identify guitars by their serial number alone and as of 1999 the company has used six distinct serial numbering systems.An exception is the year 1994, Gibson's centennial year; many 1994 serial numbers start with "94", followed by a six-digit production number. The Gibson website provides a book to help with serial number deciphering.
In 2006, Gibson introduced a nine-digit serial number system replacing the eight-digit system used since 1977, but the sixth digit now represents a batch number."
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