Murray, I've had never heard of Samick but I found their homepage: Samick
They are a Korean company that's been around for about 40 years. I couldn't find a resonator guitar in their current catalog though.
In general, I would say if the guitar is playable, and you like the sound, and it seems to be in good condition then $200 seems like a pretty good price for a resonator guitar. Have I hedged enough?
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sj