Who laid this egg?

[Tgmcr]

While putting the girls to bed tonight this dark brown egg was discovered! All of my girls either lay white, blue or very light brown eggs so this was a surprise. We have 5 new girls in the coop who have yet to start laying. One is a blue Orpington, one is a welsummer and the other 3 are ISA browns. I didn’t think any of them produced dark eggs. Does anyone know which girl may be laying this?
Thanks!
pic next to our normal brown eggs for comparison.

 

[sourland]

It is very likely from the Welsummer.

 

[springvalley123]

It is very likely from the Welsummer.

X2 but I had an amberlink (based on hoover's isa brown, come fairly close!)

 

[Laura_BelgianBantams_63]

Welsummer.

 

[aart]

Wellie.
.... or Isa, some can lay pretty dark eggs.

Might be time for an exam to find out.....
https://www.backyardchickens.com/articles/who-is-laying-and-who-is-not-butt-check.73309/