OKAY. So, my chicks are 11 weeks old now. Trying to get standing profile pictures but they have a large run and don't like to sit still, so that's a work in progress. I DID get facial pics of all four. Hopefully I can finally figure out if I got more cockerel than the one I ordered...
Black Copper Marans Chick
Look at the wing. Red there would be male on the BCM.
At 11 weeks, some pullets will have comb/wattle growth and a pink hue. None of them are red so I wouldn't fire up the frying pan yet.
Look at lower backs for emerging saddle feathers. Very skinny, shiny, sharply pointed feathers there = male. They'd show sometime in the 3-6 month range and much more reliable than gauging comb growth.