Just dug this one out of an old folder - not great condition, but unusual. Swiss Canton Schwyz 2/3 Batzen 1811. (Schwyz would be a great scrabble word if it were allowed!)
١/٤ or 1/4 Riyal from Saudi Arabia, ١٣٧٤ 1374 Hijri or 1954. The fraction, in Arabic numerals, appears on obverse bottom center. The date appears at bottom center of the obverse's inner circle.
Found another mixed number coin which I don't think was already posted: Saxe-Gotha-Altenburg 1 1/2 Pfennig 1755 Friedrich III I've been going through my unsorted old coppers bin!
I somehow got so many of the old war time zinc coins that I could high grade out the best examples and (try to) palm off the others. While they are usually rather ugly, I like them for their historical aspect. I recently got some new coins from Ukraine made of zinc alloy and they look as pretty as nickel or stainless steel, almost. Don't know how they will age and weather though. I will tack one on here just as an example, and because I like that big tough army truck!
Germany BENTHEIM-TECKLENBURG-RHEDA Johann Adolph Cu 1 1/2 Pfennig for Tecklenburg 1685 The _ above the 1 on the reverse is a sign for 1/2