4 key Hohner
I have seen these for sale on Ebay. They are no longer made. They are two sided but also have two keys on each side. Basically two different harps on each side, side by side. I had never thought about how difficult it would be to play one of these. Notice how this fellow rests one end of the harp on his arm and instead of moving the harp he has to move his head to play different notes. Quite a workout for the neck.

Hello, Rex.

Those tremolo (or octave) "quads" were made in different
models, by many companies, from circa 1890-1970s(?).
The Hohner Marine Band Echo tremolo quads had 4 keys:
C, G, D, A. The Echo quads are not seen in Hohner USA
product catalogs after the early 1970s.

Paddlewheel" quartet harps were made from the
1880s to 2000 (a guess). Paddlewheel quartets were
a set of 4 tremolos (or octave harps) that were held
together by 2 metal "stars", one at each end, left and
right. The stars had small finger handles that were twisted
one direction or another, to change keys. They were in the
keys of F, C, G, D. By 2000, the Hohner paddlewheel quartets
were discontinued, but the Hohner sextet was still available in
the 2006 catalog, keys C, D, F, G, A, Bb.

There were also a few single reed diatonic paddlewheel
quartets, made by a few manufacturers.

Quads and Quartets, sextets, quintets and trios were made
at one time or another, between the 1880s and circa 1940.

The first purpose of the quads, quartets and other groupings
was an early attempt to make more chords available to the
performer, than a standard Richter tremolo or octave harp.
Later, the different keys were used as modulations (key changes).


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