Thanks Strumelia just can't seem to figure where to post
Global musical instruments
Global was, I believe, a Korean company known for their cheap knock-offs of Gibson guitars in the 60s. What you may have found is a pretty good dulcimer. Is it hourglass or teardrop? I've got one of those Korean teardrop knock-offs of the Magic Mountains that sounds really good and plays nice as well.
A pic or url would help us advise. :)