A good question!
I only remember this particular Ritter Sport having such an effect - it was a few years ago so may not have been the Cappucino variety per se, but I'm sure it was coffee flavoured and definitely two-tone, i.e. dark choc base and milk choc on the top. I have a feeling the wrapper was dark brown. But I don't 'get off' on coffee as a rule...
It might have been the Mocha version actually...
Not sure if it's still available.