I have both C and A in 21 note version. I got mine from Rockin Ron. They did not say 2 Timer on the covers like this picture. Mine are SU 21 SP. They are nice harmonicas and quite a good deal. They seem to be identical to the SU 21 Humming except the Humming has nicer, smoother, thicker covers and nicer cover screws. The comb and reed plates appear to be the same. The covers on this one are about the same thickness as a Lee Oskar or Special 20 which is to say they are nice enough. Here are my Hummings and this C played end to end: https://www.youtube.com/watch?v=4hY6cYsVyhs&index=5&list=PLJ1G4oHit4xhn6O-f4DBKy58fQ_ap6sFT
The SU 21 in A is played end to end at about 10 or 11 minutes into this video: https://www.youtube.com/watch?v=Uh2qqt0_PpI&index=10&list=PLJ1G4oHit4xhn6O-f4DBKy58fQ_ap6sFT
Really like these harps. Only gave 4 stars because it isn't quite as nice as the Humming and I did have to tweak the tremolo rate on a couple notes on the C, but they were all playable right out of the box. Especially if you use the vamping technique. Then the tremolo rates all blend. See my Humming review because much of that review also applies to these harps. My videos feature both A and C as well as the G and D Humming. Keys and positions are in most of the video descriptions.
