Unidentified Coin #2 - Norman Sicily? Tiny

@J1M, sorry that it has taken me a little while to investigate this. I have nothing Earth-shattering for you, but here are my thoughts:

1. At 9 mm and 0.15 g, the the denomination would have to be a Fractional Follaro, although most issues of this type were a bit larger and heavier than your coin (perhaps a bit of edge chipping has reduced the dimensions and weight of your coin). The next smallest denomination (Fractional Dirham) is about the same diameter, but 0.5 to 1.0 g in weight. Even if we assume that a third of your coin has been lost to edge chipping, I don't see this coin getting up to 0.5 g.

2. I don't see a cross or eagle on this coin, which means that if it was from medieval Sicily, it would have to be from before 1189 AD or so. After that, virtually all coins have crosses or eagles or both.

3. The only ruler who minted the Fractional Follaros between 1072 and 1189 AD was Ruggero I. That means that your coin would have to be Biaggi #1212. Unfortunately, your coin is not a very good match visually. The Kufic script on your coin seems to be in two rows, while the rev of #1212 has only a single line of text. Additionally, the obv of this coin (which would correspond to your second pic) should have a solid, six-pointed star in the middle. I have cropped, enhanced, and blown-up your pic and still see nothing resembling a star in the center. I conclude therefore that your coin doesn't seem like a match for this coin.

4. I will say that the use of Kufic script plus concentric solid line circles with round denticles is pretty typical of this place and time.

5. My best guess is that this was an unofficial issue from the around the mid-12th Century. The degenerate legend in your second pic looks vaguely like REX, which is an inscription on the fairly common Fractional Follaros of William I "The Bad". Your coin would have been underweight, but perhaps was convincing enough that it circulated. This is total speculation on my part, but it is the best that I've got.

Sorry that I couldn't be more helpful!

Sorry not to have been more clear @j1m. Based soley on the diameter and weight, your coin would have to be from Ruggero I. The design is not a match at all though so I conclude that this is not one of his coins. Rather, the design is more similar to a coin of William I. I don't think that it can be an official issuance of his though.