I've just spent a fun-filled evening moving a whole bunch of identified coins out of ID required, and thought I'd add one of my own to make up for it. I picked this piece up from a dealer's bargain bin at the local coin show back in May, and have been unsuccessfully trying to ID it ever since.

It's fairly small, at 17.6mm diameter. I don't have a weight for it but can get one next week if needed. It's very thin. and lightweight.
One side has a seated figure holding a sword. The other has two standing figures with haloes - presumably saints. There's what appears to be the remnants of a legend around both sides, but very little in the way of identifiable lettering.
My first instinct was mediaeval Slavic/Balkans, but I skimmed through the Medieval Balkans book I recently purchased and didn't spot it. Closest thing I found was for a Croatian city that was under the control of Naples.
It might not even be a coin, but a religious medal. However, such medals are almost always holed or looped, and this piece bears no obvious sign of either.
Identified - moved to World Coins forum - SapDon't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis