I am 95% sure this is a cockerel. The reason I have some doubt is because his full brother (same age) has been an obvious cockerel for 2 weeks, and is fully red in the face and comb whereas this chick is spotty pink. I have someone interested in him, so I'd like some other opinions before I let him go. Seven weeks old. (Yes I know his leg color is wrong).
The white cockerel in the background is it's full brother. You can see even in the poor lighting he's redder than the chick in question.