with very rare mules both ways (IMPCPIVICT/Salus, IMPCVICT/Aequitas)
Yes, they seem to be very
rare. According to my scources,
Cunetio has 16
IMP C PI
VICT.../SALVS AVG (8 of them with Marius-portrait), Normamby has 5 (4 with Marius-portrait), Göblingen and
Minster each
had another one (compared to 2197 without PI). From
IMP C VICT.../AEQVITAS AVG, there were 3 in Normamby and 7 in
Cunetio (compared to 148 with PI, 124 of them with Marius-portrait).
I guess we'll never know. Anyway, even if it would "only" be an engraving error on a
mule, it would
still be a very
rare coin.
Lars