Wrong model or make designation is not uncommon at the DVLA, mis-classification is probably due to them farming out data entry to the cheapest out-sourcing company! Bikes of this era were listed as "Enfield" before the court case that gave Enfield India the right to use the "Royal" prefix. I'd guess that "Ebro" was the next listing to "Enfield" in the drop down menu when they did it.
REgards, Mark

