It says "NOU CA" on the outside.
The seats show clear block lettering "UB" on one side, possibly with "UE" above it.
Actual Camp Nou has the lettering
MES QUE
UN CLUB
in the seats on one side, which is FC Barcelona's motto in Catalan.*
The seats on the other side of the model have letters that might be "FCB."
I think someone's extremely confused or trolling.
* This supposedly means "more than a club" but I'm pretty sure it has something to do with pineapples.
In Catalonia, it's pineapples all the way down.