I have a newer riddle. I don't know what's this unfortunately.
His substance bronze, his diameter 45mm.
I am glad about all ideas. Possibly weight money?
It would be a little big/heavy for a vinaigrette & I'm not sure they had them in the Roman Period. Roman is about all I can say about it, as I have not seen anything like it
A pure Guess Ossie...it might be a Roman open work pendant, possibly once had a coloured stone in centre, perhaps Horse pendant just a Guess though. You do find some really nice things though, and I enjoy looking at them