I bought the same Davida 3/4 helmet mail order from England and shipped to the US that Norton has except for the tank graphics. (shipping was a small fortune.)
It just has 2 gold lines over the top and matches my sport perfectly. 250 pounds. A lot cheaper. There's a place in Massachusetts that only sells a wide selection of the old Café racer buckets, but not the 3/4, and I believe they are bot DOT compliant.