I learned how to play on an old nylon string that my mom owned when I was 14 but the first steel string guitar I ever owned was an Ovation. I think it was a Balladeer but I honestly don't know for sure. Anyways, since then I have graduated from a Washburn D10(which I still own)to my current lovelies, a Taylor 214ce and a Larrivee' LV-03RE. So, fellers, ladies, tell me your stories!
The Rooftop singers had matching Gibson, not Martin, 12-strings. In fact I don't think Martin was making 12-strings at this time. Eric played right handed and Bill played left handed and a pretty blonde stood in the middle...a perfectly symmetrical group.
In '65, I'm pretty sure your Stella would have been made by the Harmony Company.