My younger brother has just finished claiming his Polish citizenship. (It's an inherited familial citizenship, not due to any residency, etc.) He is also an American citizen, born and raised, and has an American passport.
What he does not have at this point is a Polish passport or other identification card, just the embassy documentation confirming his citizenship. If he were to travel to the Schengen zone, he would have to do so on his US passport. From the point of view of a border guard, he would be a regular US citizen under the 90/180 rule limits.
If he is unable to get his Polish id and passport before travelling, could he use a combination of his US passport and the embassy documents to show that he is a Polish citizen?
Notes:
- "Embassy documents" is kind of vague but I'm not sure what exactly they are; he made it sound like some sort of official declaration of citizenship. They're definitely not photo ID.
- He does not have a Polish last name, but rather a very obviously Spanish one. He also looks distinctly Latino which has made him nervous that someone might think the documents forgeries.
- Pretty much the question is if he can evade the 90/180 restriction on the basis of his dual citizenship while not having adequate documentation of said citizenship (eg no Polish passport or national id card).