I have noted such an As with
IMP IIII, coll. Bob Effler, Sept. 2007.
I probably made a printout of the picture, but can't easily lay
hands on it.
Also two
dupondii with the same
rev. type and
IMP IIII,
Lanz Graz IV, 1974, 432 and Sternberg XV, April 1985, by coincidence also lot 432. These two coins from the same die pair, but a different
rev. die than your As.