The CONCORD rounds I have seen all have standard bullets. I don’t think I have seen, or If I have I was not aware of it, a “CONCORD” overstamped round with the Dairt bullet.
The cases have the look of have been cleaned with a chemical similar to the commercial Case-Brite product, that gives the brass a dull, yellow color.
On the old Forum, I think we went into the Dairt/Concord question. I will look in my files later and see what I can find. I am sure there was a relationship between the two, of some kind.
I just got back from a 200 mile round trip in Bay Area traffic, and am a little beat, so it will be later tonight, and tomorrow, that I revisit this subject, if no one beats me to it.