Canton Karat 200's

I have a pair of these which are from the late 80's and I went surfing trying to find what the market value would be. Problem is the only google hit I found was someone in Moscow, Russia who had them for sale for ~ $525. Does this sound right? I tried the blue book here but the speakers were too old to show.
well they are close to ADS speakers of the time which I am familiar with. I would say between 300-400 would be a better estimate for late 80s speakers. There is a pair selling now on ebay