Hello!
This is another coin in the package of supposedly roman coins I received, but it's design is entirely unfamiliar to me and I have no idea where to start. Any hints as to the era, empire, design, historical context, etc would all be much appreciated. It has some bronze disease, so I'm also trying to figure out if buying some sesquicarbonate is worth it.

Weight: 1.72 grams
Diameter: 15mm

