A couple more coins with mixed number denominations: Venezuela 12 1/2 centimos 1945 Syria 2 1/2 piastres 1948 (AH 1367)
Luxembourg 2 1/2 centimes, 1870. This is actually the rare variety without the dot above Barth. Krause has it at $300 for MS60. Unfortunately, the verdigris probably prevents it from ever having a chance at straight grading.
A great thread and a great collecting topic. I realize that this is the world coins forum, but I feel compelled to mention that various early U.S. coins had fractions on them, as did U.S. gold quarter eagles up until 1929. https://www.usacoinbook.com/us-coins/1793-with-periods-chain-reverse-flowing-hair-large-cent.jpg