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X2 me too.
And to add to what Royce has said, I have further noticed that from one day to the next, a certain hen's egg can change due to a scare, trauma, such as sent to a show or the sight of a predator, or maybe due to weather, feed changes.
For the most part, they are stable after 1 year of age, and lay the same size & shape egg daily.
Even with all the birds I have, I can still pick out individual hen's eggs.
Weird huh?
You just get to recognize which lays what.
For example, my Blue Copper Marans lay a huge (Jumbo) very round egg, and it is impossible to tell where the air cell is without candling, which also is difficult due to the dark egg color.
Buck pullets so far seem to be a perfect egg as you would imagine it, and after a few months they elongate to a more bullet shape.
Same so far with Black Javas.