Vestapol is still around - I got it off Stefan Grossman's "How to Play Blues Guitar" LP on Elektra, then a few years later changed it to be more like "Prodigal Son" (covered by the Stones).

I always tune up to E or A to give a brighter sound on a Hohner resonator and keep another guitar in more or less standard - back in the 60s a few of us kept our (standard tuned) guitars in F because the most common harp around was the Bb!