Here's a recent acquisition.
This series has a mintmark A,B, E, M or V under the emperor's bust.
Obverse

Reverse

Under high magnification it looks vestigial and it's not clear what it is.
Another curious thing is that directly below the mintmark on the inside of the toothed border is a very faint cross (which appears to be part of the design)!

Under lower magnification, it might be the tops of a V mintmark.

1. Is this what the V mintmark top should look like ?
2. Do you think it's a different mintmark ?
3. Can you show me a coin in the same series with a V mintmark ?
4. Does a cross appear below the mintmark on other coins ?