Very Very very Large Egg

Hi,  my Welsummer has laid a 5 oz egg.  It measures 4 and a half inches from top to toe and about 6 inches in circumference.  I know this is not the biggest egg laid but I wonder if its the biggest from a Welsummer.  Any ideas folks?

Poor thing.....have you kept the egg ?....

Update on the large egg.  I did break it open expecting to find maybe a tripple yolker bu to my surprise there was one yolk but also another egg complete with shell fully hardened and when I broke this open it was just a normal egg.  How strange!!!