I believe 2002. There are a number of Marlin date code guides out there, a google search will reveal many of them. My research suggests that in 1991 Marlin began using the last two digits of the year as the first two digits of the serial. As with many things found on the web, this might be inaccurate by a year or two.
1998 model. 100-02= 98
Marlin used the first 2 digits of serial number for the years of late 1969-1971 and 1972 was a BO prefix or 72 and thereafter the first 2 digits subtracted from 100 will give the date of manufacture. Prior to this the serial numbers had a letter preceding the serial number which gave the date of manufacture.
Mr. Blueman2, we are all in this world together. If you feel like you make a mistake, learn from it and carry on! I don't believe I've had the opportunity to welcome you to the forum yet, so, Welcome!!