Hi, I kept on making some researches on my model and I found this catalog->
http://www.mark-cole.co.uk/teisco/literature.htm
On the page on the top you could see that the bodies of the BS-101 and the GB-1 are basically identical to my model, while the headstock is the same as the BS-101 (I havent't posted it, but it's the same:)) . Since the BS-101 was a mini-bass, it looks like they've used its body to make a guitar. Do you guys know anything about that?