WOW!! I can't believe I've finally found someone who has the same guitar I have! My uncle gave me a weird little SG clone back when I was 14 (15 years ago). The guitar was entirely stripped and disassembled in a black garbage bag and apparently had been sitting in his attic for decades. It was his when he was young and he had forgotten about it. The only thing I knew about it was that it was made in Japan (as was indicated on the rear of the guitar on the neck plate. I figured it was likely 70s because that was around the time my uncle bought his. Everything else about it was a mystery.
So is this guitar a Tiesco or something else?