3 months ago I bought my first lot of 34 ancient coins, it was the spark that lit the hobby. The coins were random, this was good for me as I learned how to attribute them, where to search ... Some of them were SOLI INVICTO COMITI types, I must admit that I overlooked them a little as 4th century is not my first option at all. I decided today to attribute all the lot and check if what I initially attributed is correct. Found this SOLI INVICTO COMITI, when I got the lot I spent 2 minutes studying it, there were others more interesting... Checked Helvetica's list (big thanks for all the hard work) - and cannot find any AT mintmark. Any help, please?