I have a mystery chicken that could be a SGE. She was in the ISA Brown bin at the store, 11(ish) weeks old now.
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The thing that threw me off at first was that any source that lists comb type says SGE have pea combs, but looking through the forums here, a lot of them seem to have single combs like my Sybil.
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She's likely some type of ISA Red, but maybe I'll be surprised with a green egg in the next couple months!
Here's my thread about her with pics of her growth over the weeks in the breed and gender forum
My SGE's also have single combs. Two of mine look very similar to yours. Pretty markings no matter her breed/mix.