so something similar to the "Golden" Crele Leghorn?“It may be described as a Brown Leghorn on a cream basis, to which has been added the barring factor causing it to be autosexing. It is also crested and lays a blue egg”
R.C. Punnett 1957
just a note: Crele Leghorn existed decades or even a century before the "Autosexing" Legbar, so yes they were Autosexable breeds way before the advent of the "autsexing legbar" craze