I just re-found the one that looks like this - 'burgess vine buttercup' has the same "turban" - though it seems to be knobbly rather than having this lovely William-Morris-type pattern on the skin... it's hard to tell from the tiny photo I found.
Glad you liked it - I fell in love with it - prettiest pumpkin I've ever seen. Hope it comes true next year.
There are two other photos in my gallery space.
Cheers.