The Rare Canadian 1936 Dot Cent

The 1936 King George V Dot Cent is a coin that has enthralled collectors for decades. The Royal Canadian Mint reported striking 678,823 pieces, but only a tiny number are known today, and all the extent pieces are Specimen strikings, not circulation issues or business strikes.
All three specimens have commanded six-figure prices at auction. In the initial sales the coins took over $100,000, and in more recent years the trio of rare 1936 Dot Cents have fetched much more. The record price of $402,500 goes to an example that sold in 2010 and is currently graded PCGS SP65RB, the same grade as the other of two PCGS-graded specimens.
Full article: https://www.pcgs.com/news/rare-canadian-1936-dot-cent
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Comments
Edward VIII and Wallis Simpson went on to live happily ever after as Duke and Duchess of Windsor, following their marriage in 1937.
Uh, they had a very troubled and turbulent marriage - both allegedly had affairs with others into the 1950's. Edward VIII may have let the throne for the "woman he loved", but theirs was a loveless marriage.
I've been using bags of those as doorstops.
What causes the unsightly "pooling-like" discoloration on the reverse (and a little on the obverse) of that coin?
That's a mighty expensive "dot"

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My sets: [280+ horse coins] :: [France Sowers] :: [Colorful world copper] :: [Beautiful world coins]
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I bought a 36 dot quarter out of a junk silver box, about 1983.