At last I also have found something out about my mystery Yasuma Guitar. I found my at my Grandma's place in Gipsland (victoria, Australia) when i was younger (about 10-11 i think). Lots of people would play it when they vistited, and when i was sixteen finally i convinced her to give it to me! Im not sure what model or make it is, the writing on the head is old and worn. I have never heard anything about them, all i know is that when i got it serviced, I also got a pick up putin it. The bloke who serviced it said they are very rare guitars and worth alot of money now-but had no idea how much. I never plan on selling it...its one of the only acoustics i have found with such a thin neck which i love. Its got a large body and many people comment on its sound and how load it is. Its crisp and very unique. Im glad there are others out there with similar models! Im tipping it was made in the 70's, it old....very old, in pretty good condition. Got that clasic, kind of 'country' style body shape.