Fidel doing what he does best: Moving the crowd.
I traveled to Cuba 10 years ago this summer, and I unearthed this 10-peso note when I moved earlier this summer. Coincidence, or a sign that I should return sometime soon?
When I was there, the official exchange rate was one American dollar to one Cuban peso, but one could get 20 Cuban pesos with one American dollar if one exchanged money on the street. It appears that this hasn't changed, though Wikipedia notes that Cuban pesos have no value in currency markets. When I was there, Cuba was still reeling from the collapse of the USSR, and accommodations were made to handle the hardships known of this Special Period. For example, the American dollar could be used to purchase "luxury goods," though at that point "luxury" involved eating chicken once in a while and drinking an occasional beer. They've since introduced a second currency to replace the American dollar, the convertible peso, while keeping two tiers of goods. Yanqui go home!