As far as I can tell they were originally made in Japan, and then moved to Korea, and now they’re made in China. I can’t find specific dates for each of these, nor how serial numbers map to dates. It does look like the 200S was only made in the 90’s, and the company relocated to China around 2001, so you’re looking at Japan or Korea for yours. From what little I did find, it sounds like the Japan made ones are a little bit better.
It’s surprisingly hard to find much detail about this Company, especially considering how popular they are.
Edit: Should be a sticker on the back of the headstock that indicates the Country the instrument was made in. And I also found posts (this is all coming from the mandolincafe by the way) that indicate they made the 200S in the 80’s as well. This is some tricky business.