I hatched some CCL (hen) x Lav orp (roo) eggs. All chicks looked like black orp (that part I understood) & almost all had a very tiny 1mm area of white on their heads. One had a larger 7mm spot on the head. Not sure if they were all male or if the ones with only a few light hairs were female. I simply sold them "straight run, " so I will not know the answer. What do you think?
I would say the one with the big head spot was definitely male. Crested cream legbar hens are only single barred, so they can only pass their barring to their male offspring, and it always passes, so males are always barred, and it's impossible for females to be barred. I'm not sure if the tiny spots are indicative of the chicks being barred or if it was something else that happened because of the color combinations. If they all had feathered out barred, they would all be males, because it would be impossible for the females to be barred. It just seems really unlikely that you managed to hatch all males. I'm thinking maybe the smaller head spots were caused by the weird color combinations involved and weren't really head spots that indicate sex. Too bad you didn't keep them until they at least got wing feathers, because then you would have known for sure. With CCLs, females can sometimes hatch with little white spots on their heads, but they also carry barring, so that could be why that happens. It's nowhere near the size of the spot on the males' heads, though.
I recently hatched out an accidental 'black sex link' cockerel myself. I didn't realize it until he feathered in, because his chick down didn't make it apparent. He is a buff orpington/leghorn cross. The leghorn apparently carries barring in her white feathers that can't be seen. The chick's down was yellow, so the head spot was invisible. That's why it's recommended to use black breeds when crossing, because it makes the head spot very easy to see.