I had to go through and update all the ancient coins I have on eBay.
If I had a specific date for a coin, such as the Gallienus antoninianus struck in 261 AD, I entered that. For others, I entered the reign of the emperor.
It did let me type in "AE-3" and "Centenionalis" for denominations. They were not in the options eBay provided.
It is a pain and not overly helpful since I include all of that information in my descriptions of the coins.