a Third recent addition... Braunschweig Blankenburg AV Quarter Dukat 1720 HCH Braunschweig Mint Ludwig Rudolf Furst zu Braunschweig Blankenburg
Picked this up recently while looking for Austrian interwar coinage. It didn't fit that theme, but I bought it anyway. Austria, 1760 (ND), 1/2 Kreutzer, Maria Theresa, Bronze
New purchase: Denmark, 1841, 4 Rigsbankskilling = 1¼ Schilling Courant, Christian VIII It looks copper-colored, but it's actually 0.250 billon. $2.
Closest I can think of is a Jersey 1/13th shilling. I can't find a photo offhand, but I think I own one. Here's a 1/26 shilling at least. For coins with oddly numbered denominations, such as this 1802 Austria 7 kreutzer, the reference unit is the 1 kreutzer, which would not be referred to as 1/7th of this coin. Similar to how we wouldn't call a shilling 1/21st of a guinea. (I know 21 is not a prime number, but you get the idea.)
Oh, and since I love this kind of stuff, here's a bit from my coin blog as to why Jersey pennies were 13 to the shilling: "As Jersey is geographically much closer to France than to England, French money tended to circulate. The French coinage was denominated in livres and sous, with 20 sous to the livre. Shortly after the French Revolution, there were 26 French livres to one English pound. One shilling is 1/20th of a pound, and thus one shilling was worth 26 sous. The French Revolution decimalized the currency, with one franc equaling 100 centimes. As livres and sous were obsolete, they no longer circulated readily in Jersey. I would imagine the chaos of the French Revolution and Napoleonic Wars also disrupted the flow of money to the island. To make up for this, Jersey began making its own coinage in the 1830s. One Jersey penny equalled two French sous, which meant it took 13 Jersey pence to equal one English shilling, as compared to 12 pence to the shilling in the UK proper."
And 1/4 guinea is 21/4 shillings, or 5 shillings 3 pence. This month's PCGS calendar coin is a Brasher counterstamp on a 1/4 guinea, valuing it at $1 1/6, which works out to 54 pence or 4 1/2 shillings per dollar.