Postumus 'Double' 'Sestertius' My Rear End

It must be an Ant....like the following

So you are pleased Ben?

I like the reverse.
In theory, a dupondius should weigh 25% of the weight of the double sestertius for this reign. With a significant piece missing, getting to a weight of 2.6 grams seems plausible for a bronze radiate coin of Postumus.

From my experience, all of the Postumus radiate coins of silver colour are antoninianii.

Interesting and curious piece, especially for three quid!

The only Roman denomination I can think of, that would be of equivalent scarcity, would be the BINIO. (radiate gold double aureus)

What makes you conclude that a dupondius is the correct denomination? Ants of the period range from about 2.1 to 3.5 gms. Dupondii of the period seem to bottom out at about 7.5 gms.

I have just visited the VCOINS site and found a bronze antoninianus. Perhaps this coin has only a trace if silver in it. Perhaps it is barbarous, but the reverse looks good.

Sometimes, a billon coin can look to be composed of bronze if the burial environment is enough to make a billon coin appear to be bronze, but I don't think that is the case here, when you look at the break area on the reverse picture.

I will have to admit that I do not recall ever seeing a bronze radiate of Postumus weighing in the 7 to 9 grammes range, but that does not mean much.

If you go to the VCOINS site, and search 'Postumus dupondius', you get a wide weight range of coins, and it is obvious that a lot of them are barbarous. That helps to confuse the issue somewhat in this thread.

Worth a look for our own education.