@January, you are right, there is an S after Millim. A friend who knows some arabic can read some words "kantin" and "machin", so it may have had some use in vending machine. And of course now that I think of it, it should be from one of the countries that use Millim as a denomination, like Tunisia.
I was fixated on the hole, as some of the Egyptian 5 Milliemes coins have.