Who's laying the JUMBO egg?

[BCMominMD]

I have 7 pullets that are 23 weeks and have been laying for the past 3 weeks. One is has layed 2 HUGE eggs this week- 76 gms today! I know it's not the Wyandottes or EE (one lays blue and I don't think the other is laying yet) that leaves the black stars or the white rock? Haven't eaten then yet to see if they are double yolkers.
Any idea who it might be?

 

[purelypoultry]

The only way you would be able to tell is to separate each hen or to catch the bird in the act.