Where are you getting those numbers from? I highly doubt them and would like to see a source. Birds producing north of 200 eggs were very rare until the 1910-1920's, even the Mediterranean breeds were topping out in the 240-250 range most the time. And all the old literature I've read has said that Those breeds were considered dual purpose with good meat qualities especially the Orpington.
The Australorp record is pretty well published. According to Wikipedia a team of 6 hens in 1922 laid an average of 309.5 eggs each over a year without modern lighting practices. Later that record was broken by a hen laying 364 out of 365 days.
The Orpington egg production numbers were from "a field guide to chickens." As much as SOP breeders criticize hatcheries, it seems anything not visible at a show is forgotten by the backyard breeder like egg production and even egg color sometimes. Then egg color is something both hatcheries and some sop breeders do not preserve.
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