I believe that you have a real gem of a Jumbo maple guitar there. Here is a way to decode the serial number. I found it on the Taylor website. Hope it helps.
9-Digit Serial Numbers
From 1993 until the end of 1999, each Taylor guitar featured a nine-digit serial number that pinpoints when work began on that guitar, along with its series and production position. See the explanation for serial number 980311301 below:
980311301 First two digits indicate the year - 98 (1998)
980311301 3rd & 4th digits indicate the two-digit month - 03 (March)
980311301 5th & 6th digit indicate the day - 11 (the 11th)
980311301 7th digit is a series code number - 0 for 300 or 400 Series, 1 for 500 through Presentation Series, 2 for 200 Series, 3 for a Baby, 4 for a Big Baby, 5 for a T5, 7 for Nylon Series, 8 for 100 Series, and 9 for SolidBody Series. This example is number 3, a Baby.
980311301 Last two digits indicate the guitar's position in that day's production sequence.