I have a 12-hole solo system Hohner #364-S that I really
enjoy. It's sold only in the key of C, but Seydel and other
harp makers may sell it as a special order harp, in any key.
I have two Hohner #365 Marine Band extended range diatonics,
one in C and one in G. They are 14-hole Richter system harps,
until holes 11-14.
Key of C harp
Large letters are exhale reeds; small letters are inhale:
||Cd |Eg |Gb |Cd |Ef |Ga |bC |dE |fG |aC |bE |dG |fC |aE ||
Notice the crazy reed placement in the high octave. I never felt
comfortable with that setup. Both #365 harps are in a drawer,
not used.
I had a Hohner #365-SBS Steve Baker Marine Band extended range
diatonic harp, about 10 years ago. Production of the SBS-MB was
ended a few years after that. The tone was excellent, wood comb.
It was a 14-hole standard Richter system reed placement, with an
extra octave below the standard 10-hole blues harp. Key of C.
The extra octave was the same reed placement as the 1st three holes
of a 10-hole Richter system blues harp, an octave lower:
||Cd |Eg |Gb |Cd |Eg |Gb |Cd |Ef |Ga |bC |dE |fG |aC |bE ||
(Large letters are exhale reeds; small letters are inhale reeds)
I imagine that it would be an excellent harp for blues players. The first
(lowest pitch) 3 holes were bendable, same as the next three holes.
It sat in a drawer for a few years, then I traded it for another harp.
The only other extended range harps I have are slide chromatics
(14-, 16-holes) and the extended range Hohner bass harp.
Best Regards, Stay Healthy
JB