Cheers for that.6 digit serial number means it's a japanese one and not a korean one from what I understand, you could try contacing TUNE japan and see if they can help you out.
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Just received an email back from Tune. They said...
"Hello, your TBC-5 was made in Japan 1993. The top wood is Bubinga and back wood is Mahogany.
Neck wood is Hard Maple and fingerboard is Ebony."
Cheers for your help.
