I'll post this one because, although it is in rag order, it is rare to find any of these. James II Halfpenny, date probably 1687, struck in Tin with a copper core to reduce degradation. Tin coins were struck for a short while in England from 1684 to 1693 because Tin was more readily available than copper. The problem of its rapid deterioration brought the experiment to an early halt. This one was listed at a local coin auction with an estimate of £6 - 10. I spoke to their coin man, who had got no further than looking at the condition and did not realise the scarcity. Sadly others had also spotted it, so I spent a lot more than that to get it!
My 1929 date of the coin. Still need the 1931 at which point the 3-year collection is complete! Plenty of examples available on eBay for 50% more than they are worth, so I will wait.
Does it count as recently acquired if it's recently discovered? Admittedly I haven't delved into my coin collection in years, so in properly going through it I "acquired" these ones: Canadian Silver Dollars, all in various states of wear. Earliest in the collection is from 1949 Canadian Provincial Dollars, all in various states of wear. Earliest is from 1958 Most of the pieces I have are minted for British Columbia.
Here's part of my world coin junk box haul from the March Baltimore Whitman show. France, 10 centimes, 1854 W (Lille mint): Napoleon III was the nephew of Napoleon Bonaparte. He was elected President of the Second Republic in 1848, and in 1852 declared himself Emperor. His reign was generally a time of prosperity and increasing international power for France, but in 1870 he was captured alive by Prussia during the Franco-Prussian War, and the French government stripped him from power and declared the Third Republic. He went into exile and died in 1873.
Another coin from the March junk box: Bhutan, deb rupee (half rupee), no date, struck c. 1835-1910. This is a rather crude coin for the 19th century, hand-struck and rather thick. The overall shape and many parallel lines in the design make this feel almost like a tiny metal waffle in hand .