Helmets/busts from this issue could be a real pain...
Dear Tjaart, your initial attribution was correct. Your coin is ROME 184 (unlisted officina T), bust type D2 (not D7). Helmet on your coin apparently has a visor. Bowl-shaped helmets from this issue usually have "a narrow stripe along the lower edge decorated with dots".
Nice coin! I would be happy if you could make a better (sharper) picture. Your coin deserve it!