It is in the last few digits of the HIN . . .
The format has changed slightly over the years and like Stu said, the Catalina 22 site (www.catalina22.org) has a page about the various formats. So, you should be able to tell.The current owner should know what model year the boat is, and if you suspect a problem with that, proceed with caution. The owner should also have the title in hand available for your eyes. It may be a matter of the owner needing to get the paperwork in order. I would accept nothing less. There are plenty of C22's out there.Regards,Ted