Who know’s what they’ve done. They obviously do small run custom casting of various sorts at their shop, so it looks like they’ve taken a K series apart and made their own version - perhaps with some minor alterations to avoid getting sued for copyright. The design is pretty old so they may be clear of those laws - not sure. You’d have to check with them to see if parts such as gaskets and diaphragms are interchangeable. My guess would be yes.
Nothing that would tempt me I have to say. The price isn’t that much cheaper than a genuine Airchime (albeit 2nd hand vs new).
Contacted them asking how they compared to the real deal and this is their response:
They are similar in design but the diaphragm design is different from the original nathans. These also come with a lifetime warranty against manufacture defects for as long as they do not endure physical damage. If you have any questions please feel free to contact me directly a (786)-xxx-xxxx for any other questions. please visit our wedsite for videos and other products.
they sound louder then the original because we added extra resistance in the diaphragm housing in the back side of the trumpets. Thus requiring more air to sound them off and in turn making the sound louder with more depth of tone from each individual note.