Whoa! I just came across this website, check out the "Rhode Island Silver":
http://adkersonfarm.webs.com/poultryonthefarm.htm
Based on this, my guess would be the Delaware would be an easy breed to recreate from the foundation breeds. That's a nice looking Delaware pullet! (Aside from the RIR body.) We should talk to this guy about his development of this variety. Maybe the Dels weren't some kind of rare sport that popped up, after all?
http://adkersonfarm.webs.com/poultryonthefarm.htm
Based on this, my guess would be the Delaware would be an easy breed to recreate from the foundation breeds. That's a nice looking Delaware pullet! (Aside from the RIR body.) We should talk to this guy about his development of this variety. Maybe the Dels weren't some kind of rare sport that popped up, after all?