I believe there is no written standard. From what I have read, the Drydens were interested in the creation of a dual purpose white egg layer and not so much the physical aesthetics of the bird. Things like feather pattern and comb structure and placement that are immaterial in terms of the function of the breed were not factored into their breeding plan.
I assume that feed conversion, and meat and egg production were.
Because they aren't on APA radar they really never took off in a big way other than as the male half of the CA White hybrid. That is exactly the reason they NEED promotion IMO.
The goal I currently have is to create a place where people who have CA Greys, birds and hatching eggs, can be listed. A lot of us would like to aviod hatcheries and other people refuse to use them. In the last year I have encouraged multiple people to give them a try and had them sold on the breed but they could not find what they considered a suitable source and so they didn't get them.
So here is a shout out to all tagged people. If you have a CA Grey flock that you KNOW comes from the Dryden lines please tell us. Privett hatchery in NM has their line so if you ordered from them originally you got Dryden birds.
Thanks!