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It's hard to tell with crosses so I'd say it is too young. That said, if it is a cross, there is no real way to tell what the comb will be in future generations.

That's cool. Dark laying breeds, in order of lighter to darker are Langshan, Barnevelder, Welsummer, Empordanesa, Penedesenca and Marans. (but not all Marans)

Olive eggs are a good possibility but I don't see anything dark in those breeds.