If that really is a 1999 it will never have been used only twice in 22yrs.... folks make such claims but rarely true. Also it is one year off the first production and four years over when they usually give glue problems. If that is a boat with all its OE bits like seat, pump, bow bag and Zodiac transom wheels value around £500-£600 if no seam splitting yet.
If you view look so so hard at any clue the seams are parting or for previous glue repairs.
You'd probably be far better off at that money with a new Honwave T38.