San Rensho made a lot of MTBs over the years, using a number of different designs. that said, I've never seen that particular one before. I'd also be a bit suspicious if it's only 8 years old. As far as I know, San Rensho stopped making bikes more than ten years ago after Konno (the main builder) was paralyzed in a car accident. Makino continued to build under the Rensho name for a few years after that, but then moved to using his name (Makino) on the bikes instead of Rensho soon after.