I've arrived.
So yes, they are pure Orpingtons judging by that photo. Do you have any other pictures of the parents? And do you have the original wording of the ad, by the seller? It's very hard to judge type from that photo, but I see nothing to indicate the birds are "English-type". They look better than most American-bred Lavender Orpingtons, and that's mostly because the rooster isn't super tall with a squirrel tail. The hen I can see has a very high tail set though.
This is what a
proper English-type, Lavender Orpington should look like.
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See how the birds are much larger and have loose feathering. That's correct for the English Type.
These are more typical of the American-type since they've become so popular.
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Yuck! As you can see the differences are pretty easy to spot. Generally English are much more expensive to obtain than their
-er relations. I'd say less costly birds indicate American-type, but I've seen American cockerels being sold for $60 each as pullets. So you'll have to judge on photos of the parents and how the chicks develop and look as they get older. I would not get your hopes up though if you were expecting a group of fat-bottomed girls.
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