Yeah, there’s a homologation tag at the rear cross member bar behind the seat, it should tell you the year and model.
By the description on the pictures looks to be a mid 2004 to 2008 , and it is a Cadet Kart ( Junior ) And the engine I just can’t tell if it’s a Rotax, or a Gazele.
A good cleaning, hoping that the hydraulic brake system works, or a good rebuilding of the brakes, and hoping the engine runs flowlessly may be worth anywhere from $1,000 to $1,500 for the right buyer (but nobody runs that engine anymore) And for a quick sale may go for $800 to $900
Or you might be able to part it out, but I’m not sure what your plans are, just trying to answer your question. Anyhow hope this helps.