My Black Penedesencas pullets are some sort of a mess. They're tinier than my commercial-strain White Leghorns. I had to incubate four dozens, over five attempts, in order to hatch a trio and a single. The rooster got Marek's and the second one got hawked. At least they don't eat much.
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Are you positive that's a BCM and not a single-combed Olive Egger cull laying that egg?
My oldest Olive Egger is 7 weeks old. I'm pretty sure it's a Black Copper Marans. I got the pullet who lays them from Wynette, who also has a hen that does the same thing with her eggs on occasion...