I didn't see an answer to one of your questions. While the 118M and 118V were frequently sold with Coliseum Bass heads, each was its own product. Heads and cabinets were sold separately. So no, neither the 118M nor the 118V was ever called a Coliseum cabinet by Sunn, as far as I know. Even in the catalog, they were shown with both Coliseum heads and with the Model T for tube fans.