Lavender Orpington - rooster or hen? Dude or lady?

[Cliffordbe]

She’s supposed to be guaranteed female from where we got her but she’s been making some awfully rooster sounding noises and is quite large. Around 12 weeks old. No experience with roosters or this breed we were given a mix of breeds and ages.

 

[nuthatched]

Hatcheries can only guarantee 90% accuracy in sexing. It's a cockerel.

 

[HappyClucker7]

Looks like a cockerel.