[trebleshot]

You already know what the figure is, so having a second "ID This Toy" thread is unnecessary. Merged.

As to the topic at hand, I don't know how rare yours is, but it looks like a packaging error since Iron Man wasn't in Series 3.

EDIT: At least in the US, he wasn't. No idea how foreign releases went. Does it have any other languages on the packaging besides English?

As for what it's worth, that's going to depend on what people are willing to pay for it. Most of the time, packaging errors/variants aren't worth any more or less than their regular counterparts. But then there are some completionists who will pay through the nose for any variant, no matter what. Good luck!