So I raised American Game Fowl and there is a thing where males would look sorta like females and were referred to as Hennies. They could pop up in other breeds like some Asian breeds and they could be bred for the trait of hen feathers.
I have a "Hen" like that. The woman I got him from said he was a laying hen, even had one of the saddles on him. He was a young rooster, and he's huge now.
Well, if sesame started as a hen, that ship has sailed lol. I'm fairly sure we just couldn't tell until the visible characteristics were there.
The mix is cochin and orpington, or so the breeder said. So an incorrect sexing attempt on that end is what I suspect, rather than the sex reversal. I've been told that hybrids of that mix can be difficult to sex correctly.
It would be kinda cool if it was sex reversal, though.
The little bugger sure does crow well, and is a holy terror to anything trying to invade the yard.
We've got a young pullet now, too, which should be interesting. We've even talked about a third, though the whole thing started just trying to give this bird a home that would provide feed and shelter. Our neighbor had a batch of chicks, and the neighborhood had to stage an intervention because it wasn't right. This one got sent to a place that couldn't keep it, so we took it in.
I doubted all the jokes about how you end up with more chickens, no matter what you do, but I really didn't think it would happen lol.