Small, non-silver radiate of Gordian III (help)

I obtained this small radiate of Gordian III which should have been easy to attribute, but proved to be rather tough.

Obv: IMP CAES M ANT GORDIANVS AVG
Rev: LIBERALIT AS AVG III
Diam:21mm
Weight:4.7g

I am quite certain this isn't a provincial coin. The radiate crown then denotes either a dupondius, or an antoninianus.

However, it is obviously way too small to be a dupondius, but is not silver enough to be an ant.

Also, the only Liberalitas reverses that end in -AVG III on Wildwinds are the silver ants and laureate sestertii.

I know I'm missing something obvious.

 

Log in or Sign up to hide this ad.

Sorry for the obvious, but in my ignorance of what modules looked like as late as this, I'm Really Wanting it to be a smallish dupondius.

 

Antoninianus, contemporary counterfeit?

 

I think it is an antoninianus where the base metal content has corroded and ruined the coin. I have a Septimius Severus denarius that is literally green because of the same phenomenon.

 

My instinct is telling me that this is the long exposed core of a fouree.

 

...interesting and ancient...what they said...

 

Interesting thought that it's a fourree. I didn't think about that, as there appears to be a pretty decent dark green patina.

 

After more searching I found that Gordian did in fact produce “light dupondius” about 22-23 mm. So it could be