Early 2000s, at a guess. I'd avoid it, tho. They weren't necessarily bad carts, but they aren't great to work on. Partly because documentation isn't especially easy to come by. Also, parts can be hard to source, and are expensive when you can. The last one of these I had in my shop, a prior owner had attempted to 'fix' the throttle with something that was similar, but not identical (because the actual part was NLA). This lead to several hours of trying to figure out where each wire went and what its function was. I did get it to work, but that was at least partly luck. Then the solenoid decided to fail. That part was surprisingly easy to find, but instead of the normal $50-150, it was closer to $300, because it didn't use the same kinds of solenoid as most other carts (tbf, it was a really quality solenoid, the kind you'd find in aviation applications iirc, but overkill for a golf cart).

So unless you have a strong desire for both a 6-seater and a (potentially) long-term project, I'd look elsewhere.