Interesting coin.
The horseman reaching back
type (FH3 in both
LRBC and RIC-VIII) was not that widespread before Magnentius' usurpation, but became a
bit more common before
Decentius was named
caesar (which I date to late May or early June 351, not the traditional date of July/August 350, based on
Curtis Clay's re-dating of Nepotian's usurpation as described in
his posting on
forum in April 2010 - more details in my forthcoming book).
From mid-349 to the end of 350 the FH3 was only struck at
Constantinople,
Nicomedia and
Antioch. Through 351 and 352 it was also struck at
Siscia,
Sirmium,
Heraclea,
Cyzicus and
Alexandria as well as the three original mints.
Stylistically your's reminds me a
bit of the large FH
types struck at
Siscia and, especially,
Constantinople. Overall pose, plus the way the "skirt" is treated and the ringed edge of the
shield. But maybe others see different parallels.
I think that the
mint mark though might be copying something completely different like RS.
Size poses another problem. The falling horseman does not drop to this size until well after
Decentius death in August 353. I see no reason why someone would make dies for
Decentius years after
his death.
It could have been intentionally struck while
Decentius was alive as the smallest of the FTR
denomination, but I find that unlikely.
Magnentius struck very very few coins of the smallest
denomination (1/120 L) - the very
rare BEATITVDO PVBLICA and
VIRTVS EXERCITVS types at
Aquileia (the latter known for
Decentius though super
rare) and the very
rare Two victories with
VOT X on
shield struck at
Rome (which might only be
imitative).
So I think that the most likely scenario is that it was struck during Decentius' lifetime, but was just struck as a small
imitative, like all the
SALVS imitatives, and did not intentionally copy the small
denomination size.
Shawn