While I agree with the VI/XII readings, this does show the problem when working with rare coins that don't always come in mint state. In my field (Eastern Septimius) we often get help from die identity because the coins were made from very few dies and it is not unusual to be able to ID a coin when the important letters are completely missing. For example, the three coins below are all from the same die but not all have legibility on the important parts. We get, at best, what exists and what we can find. We do what we can do with what we get.
While this thread had taken a bizarre twist, (David wins most patient poster of the month award) that coin is an outstanding find. If it weren't for your excellent detective work, it would have never been appreciated as the rarity it is.
Another great find Dave. Probably 98% of us would have just seen Minerva advancing reverse with no special attributes. Its a good lesson. We should all look close at what we have.