General Question About Marc Antony Galley Coins

The Antony legionary denarii had a lower silver content than other denarii of the late Republican period. When Trajan debased the silver coinage, most Republican and Julio-Claudian denarii were withdrawn. Because the Antony denarii were of about the same silver content as Trajan's debased denarii, they continued to circulate and are often found much worn.

For an idea of just how worn and used they were: a particularly well-used example was found in the Beau Street hoard, which was probably assembled in the mid-to-late 3rd century AD, i.e. about 300 years later.

Imagine if, among all the assorted clad quarters, you could still sometimes find an extremely worn coin of George II, Louis XIII, or Philip V. It sounds completely impossible, right? But this is exactly how old that one Mark Antony denarius was when it ended up in the Beau Street hoard.

EDIT: to clarify somewhat, technically the Beau Street hoard actually cheated a bit by including a bag full of metaphorical silver quarters next to the clad ones (or, dropping the metaphor, a bag of denarii next to several bags of debased radiates), which naturally leads to some suspicion that this particular part - which is the one with the Mark Antony denarius - might have been assembled a bit earlier.
But even that would still only knock perhaps 2-3 decades - if that - off the three centuries between that hoard and Mark Antony.