Shell, I'm not sure about Zebra on yours. Looks like blue base with white ribbons. I don't know what name that would be though, so maybe I'm being too rigid to require the base to be white. Maybe others have decided to include it in the Zebra umbrella and I missed it!
Richard, the Pelt seams can be tricky to find when the thing is swirly. And the ribbons can be hard to count. But somewhere in there there need to be four (or six) separate ribbons.
The other possibility is that it's an Alley with basically one ribbon that might occasionally be broken up by dipping into the base.