Note: This interesting coin has a rare mis-spelling in the obverse legend, omitting the T of ETRVSCILLA, so that it reads HER ERVSCILLA AVG.

There is clearly one character too few. The lettering at the start of the obverse legend is not very clear, though I am confident of the reading given above. This opinion is shared by "Rupert" on Forum, who said: "The reading of the obverse is made difficult by poorly shaped letters (which is common in that era) and the die which isn't really fresh anymore.
The first letter, IMHO, is an H with the serifs on top and bottom of the vertical bars quite strong and thus suggesting horizontal bars which aren't really there.
The second one is a clear E.
The third is a clear right that looks typical, badly shaped for us today, but they seem to have written it like this - we must remember that they had no ball pens and round curves were generally harder to engrave than straight lines. The fifth is a clear right too.
The fourth letter is clogged in the die and might be an E as well as an H, but in the context I see no real reason to doubt that it be an E.
So I think the - official - coin really does read, as suggested by moonmoth, HER ERUSCILLA. This is a coin that won't rewrite history but which many people, including me, would certainly like to have."