On 11/5/89 I found an AU 1956-D Lincoln cent during one of my casino hunting excursions. Back then I put any wheatie into a 2x2 that was XF or better. While examining it I noticed what looked like a faint extra D mintmark separate and below the primary D. This was before the Cherrypicker's Guide existed, so all I had to go by was "The RPM Book" (1983) and I was stoked to find it listed.
Then I bought my first Cherrypicker's Guide in 1992 and when I saw that it was fairly rare and had value I decided to get it slabbed. But back then the big companies didn't attribute the Guide's FS numbers, so I waited. Then in 1996 a smaller TPGS called PCI offered FS numbers with their slabs, and I sent it off. The whole transaction was around $15 and it came back with an AU grade and FS# attribution.
I sold it several years ago but it remains the only found coin I've had slabbed.
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