No, it’s not fake. There are plenty of instruments from as far back as the 1960s that were stored away and remain in new looking condition. There are imitations of these early Hohners, most from the 1960s, but no “fake” ones. It would not be worthwhile to create fake imitations of these models, since they are so readily available. If it were a genuine fake, it would be a curiosity worth far more than a real early Hohner 26 button model. Making fakes of this would be like making fake U.S. 1970s pennies.