Looking at this from my side of the fence, this is my impression, and it's no reflection on anyone.
I was into brugmansia for years... so many people tried to ID a brug by the looks of the flower.. which is impossible... Just cause a bloom looked like an named variety, it's sold on
ebay as a named variety.. only to have the purchaser grow it out for a year to find out it's not what they bought.
I believe a partridge rock pullet/hen could easily be mistaken for a Barnevelder by someone who doesn't know... and labeled as such.. possibly bred with a Barnevelder.. or whatever.. and sold as a Barnevelder...
Honestly, I don't know the origin of my pair. They were given to me and the girl that had them was not positive of their origin... so to keep them from being incorrectly labeled as a certian strain.. I leave it unknown. They are exceptionally beautiful and produce amazing chicks.. so that's what is important to me.
I do know that out of all the chicks I've hatched, they all feathered out with obvious lacing.. No where in all my studies of Barnevelders was there mention of barring in the feathers.. There are 2 strains of Barnevelders. Single Laced and Double Laced..
The single laced were used for their dark eggs, while the Double Laced were the show birds with lighter brown eggs. I had a double laced pair.. her eggs were not that dark, but they were big and beautiful.
I will get try to get a pic of the one I have outside.. but understand I'm on day one of my vacation.. (second one in 6 years) and it's crazy right now.. OTOH.. this thread has been one of those brain twisters that sparked my curiosity.
Here is a chick that is probably about 2 or 3 weeks old.. I'm guessing... Even here, you can see that the tips of the feathers are lacing..