I do not own a 6.5 Powertone. I would like to. In wood and cob. I do however own three wood Powertones, 63, 65, 66. And, a 64 Tower, all 5x14. I owned a 1963 Cleveland 5x14 COB (which I gifted to the admin of the Rogers Owners forum), a 5x14 first/second quarter 1967 Dayton COB (which I gifted to a young drummer in need of a quality snare drum), and am the present owner of a 1970 5x14 COB Fullerton. To most ears, there is no noticeable difference in sound. I think the Fullerton was brighter. It was slightly lighter in weight. Not by much. They are beautiful drums. And a good investment in vintage.
There are some early Powertones, late 62/early63 with Bread and Butter lugs. After that, from 63 on, Beavertail lugs. Any Powertone with beavertail lugs will put a smile on your face.