I was in a music store today that had a cool old Harmony Stratone H44. It looked all original and the price was decent. The only problem is that it fretted out in many different spots at the 9th fret and higher. I didn't even have to bend. Just some wide vibrato was enough to cause the fret out. The radius is quite flat. The neck had some back bow, but nothing crazy. Of course there is no truss rod. The action was reasonable. Maybe even a touch high by some standards. What do you guys suppose the problem is, and how could it be addressed?