Sorry, I forgot that non-members can't normally see FORVM pics. I'll see what I can do.
Is that working for everyone, or does it red-X for everyone but me? FORVM and KOTCT are both Simple Machines based forums; maybe the picture encoding will translate across.
Latest opinion over there is it might be Byzantine, rather than Roman. In which case, it wouldn't be record-breaking. The Axumites in Ethiopia had bimetallic coins before this.
Here's an example on CoinArchives of a bimetallic Axumite coin from around 525 AD; a base-silver coin with small flakes of gold leaf pressed into it.