During Bernunzio's big expansion sale, I bought this 1930's Regal Octofone today. Scale is just under 21 inches; birch sides and back, spruce top. The headstock has been repaired. John B's strung it with OM strings, but I may be experimenting in the future. Very light weight, bright sound, and a lot of projection; workmanship seems quite clean for what was obviously not a primo instrument 75 years ago.
Interested in comments -- and in knowing if anyone's ever owned another Octofone, and if so, how he or she strung/tuned/used the instrument.
Later: edited for spelling -- "Octofone" not "Octophone." What was I thinking?