What the heck is this? Identifying breed of large orange speckled chicken.

[Katakornchicks]

I could give you some breeds, but to be honest it's not really plausible that a rare breed was sold on Craigslist as a golden comet, so I'm going to go out on a limb and say BYM

I agree totally that she's a mix, I just want to know what makes her so big! And why she has almost a mille fluer pattern. I don't usually see that pattern outside of bantam breeds.
We do live near a fairly well known massive monthly farm auction and I've seen some really weird stuff there. It's not completely impossible that it isn't mixed with something rare.
Also the listing photo did indeed show a lot of regular looking golden comets, regular looking EEs, and then this monstrosity in the middle. Nothing else in the provided photos looked like her.