Musque De Provence or in the US it is called Fairytale Pumpkin
Fairytale pumpkin is flat smooth ribbed hard surface, bigger than the long Island cheese pumpkin. Average wieght is 8-15 pounds. The flesh is a deep orange moderately sweet. The outside flesh is green in color and once matures turns to a smooth shade of pumpkin, like a long Island Cheese pumpkin. Great for cooking because the grain is very fine and smooth.
This pumpkin originated from France. Supermarkets and farmer's markets sell it cut as wedges for cooking.
A nice artical on Musque De Provence pumpkin read here.