i first heard of them four or five years ago. i think they are from crossing cuckoo on copper blacks, then back to cuckoo to set the barring and keep the copper coloring on the hackles, So... they have probably been around as long as people have been crossing colors, or deades probably.
I am having a staggard hatch already because I have 12 blue marans from peachick and some ameracaunas from Happychick already due on the 9th in the bator too. Maybe in a week or so I will get some more eggs. This is getting to be addicting....