Octave harmonicas are similar to tremelo models in reed layout and musical range.
Instead of having reeds tuned to the same note, however, each double hole has one reed tuned an octave apart from the other.
The resulting sound is stronger and full bodied, but without the tremolo effect.
This is the harmonica equivalent of a twelve-string guitar and is ideal for regional and international styles like Cajun, Old-Time and Irish music.

1493 Echo

A member of the Echo Octave series, this model features a wood body which adds resonance to the rich octave tuning. Open backed covers amplify and project the sound out to the audience, and the curved mouthpiece makes the high and low notes easy to reach.

Specifications:

16 double holes, 32 reeds

Keys: C,G

Length: 5" 

Unique and beautiful, this is Hohner's finest double-sided octave-tuned harmonica. Gold anodized covers with the name cut out and backed by red silk gauze.

Specifications:  40 double holes, 80 reeds

Key combinations: G-C, C-F   Length: 6 1/4"

105 Auto Valve Harp

Tuned the same as Marine Band style diatonics, the Auto Valve is fitted with wind saving valves which, along with its double reed, octave tuning, produces a tremendous volume and projection. This, along with the wide range of available keys, makes it ideal as an ensemble instrument, be it with Cajun, Polka or String Bands, and gives it the power to stand as an impressive solo model as well.

Specifications:    10 double holes,       40 reeds        Keys: A, Bb, C, D, E, F, G          Length: 4 5/8"