1st generation will not show the mottling of the Exchecquer, unless the rooster is a mottle carrier. Most likely not though.
I'm anxious to see the outcome.
This was my understanding too, that I'd need an Exchequer roo to continue the mottled from my Exchequer hen.
Seen a couple of debates...
Curious what colours I may end up with if I decide to incubate eggs from my blue-red Leghorn roo and Exchequer Leghorn hen. Has anyone done this, and if so, what did you end up with?