Why yes, Silver, I have a Champion! 
Serial # A 12193, stamped 'MADE IN FRANCE' in tiny letters on UJ and LJ, identical logo with stylized eagle and 3 stars beneath name on UJ and bell, no markings on barrel. Doesn't being made in France preclude it from being an Amati stencil, though?
The French may have their own "Champions", I think. You see, these are not protected trademark names. Any maker can use the names "Artist", "Prestige", "Champion", "La Couture (which is in France, not Bohemia)", or even "Amati", which was a the master violin maker that apprenticed Stradivari in Italy.
When it comes to identifying clarinets with names other than the makers' names (stencils), the only things we can depend on are direct comparisons of the physical artifacts and the country of origin export marks, and other small details like the locations and fonts used in the serial numbers.
A critical part of the exercise is finding a Champion (well known that there are many other artists or Artistes, like the PM Artist that we'd never confuse with an Amati) that is not an Amati while looking for the one that is an Amati.