I know that Annobón was colonized by the Portuguese, for something like 300 year.
But is the flag of the province Annobón really this one ?
It's kind strange that they still use a flag with portuguese simbols and even more strange is the closer "ex-Portuguese colony" was São Tomé and Príncipe but the coat of arms is from Cape Verde
Can you confirm this flag ?
No, it seems to be fake. A user by the name of EG111111 uploaded flags for all the Equatoguinean provinces to Wikimedia Commons in 2013, but didn't provide any sources. There's no evidence of them on more reliable flag sites.
http://commons.wikimedia.org/wiki/Category:Flags_of_the_provinces_of_Equatorial_Guinea
Design-wise they seem to rely a lot on Portugese and Spanish colonial symbols, which is just not what you'd expect to see from an independent African country. You especially wouldn't expect to see the colonial arms of Cabo Verde (assigned in 1935) on an island 3600 km away that had passed to Spain in the eighteenth century. It doesn't make sense. There's another flag that's patterned after apartheid-era South Africa, which just seems completely implausible to me.
Commons is overflowing with fake flags like this, and though many of them get caught by watchful editors there are still lots that get used on Wikipedia as if they're real. It's always good to double check on a more reliable website like Flags of the World.
