Nice Eggs!
I would not think it is an orpington egg though. Do you have any sexlink chickens?
Sexlink - hmmm, like crested cream legbar? I have 1 of them but she lays a bluish egg.
Maybe it was my turken. The color is correct. She's 4 or 5 yrs old.
Or maybe the Langshan? I don't remember what color she lays but they've been big.
I've never had a double-yolker from my flock that I knew of.
I sell about half my eggs a year but I've asked people to tell if they get one & so far, not.
I've never had an egg bigger than 80 grams either.