Well, I have two Golden Lakenvelders I bought as 10 month old pullets, so I don't have any experience with the youngsters, but I'm going to say that's a pullet.
I don't have the trained eyes y'all have, BUT I can tell you as a relative newbie, I really thought my new Lakenvelder pullets looked a whole lot like roosters, given the combs and the way they hold their tail feathers. So I'm applying my experience to this thread and saying, "Bet that's a pullet."