That is a Chess Challenger 10 from 1977, with 16 buttons, so I guess it is the C-version, right? One of the earliest chess computers there are, it came right after the model 3. A marvellous looking piece, right like the design was done in those years, the book-form chess Challengers are real classics. I myself have a CC Voice, very much the same layout, but more black instead of red-brown.
ELO (US) was around 1200-1300. There were three versions, but all of them played very much the same. The A- and B_models had only 12 buttons. It's a real beauty, so take good care of it. Many consider it to be one of the best looking computers ever.
After the CC10 came the ugly CC7 (7 levels to choose from), all plastic, ugly colours, and only a little tougher in skill. Next was the CC Voice, and then they changed to the new pressure-sensor design, starting with the CC Sensory 8, which was relatively cheap, and the CC Sensory Voice, which included wood again. I am in desperate search for a CC Sensory Champion, looking much the same like the Sensory Voice. The follow up to that is legendary Elite Champion, of which only 500 were produced, with small bronze plates with the first owner's name on them - a true, rare and very epensive collector's item. They used that software as a basis to produce the cheaper Sensory 9 with green colour then, which returned to the cheaper layout of the Sensory 8 but kept a far better playing level - I still like to play with my Sensory 9 today.
Don't get me started!!!
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