The revolutionary design concept of the CX12 is as simple as it is ingenious. The comb and reed plate assembly is mounted in a one-piece mouthpiece / cover unit and secured in place by a powerful steel spring at the back.
Despite its light action, the slide is exceptionally airtight. The CX12 was first introduced at the Frankfurt Music Trade Fair in 1992 and went on to win the German Industry Design Award shortly afterwards.
This outstanding construction remains essentially unchanged today and is the first choice of chromatic stars such as Bill Barrett and LA studio crack Tollak Ollestad. Source: Hohner Site
All CX12 models are hand-made in Germany.
Just got this new CX-12 (have an old one). I only can play 4 tunes, but I am working on more. :)