British Coins "Petition" Crown + Museum Quality Coins -The Art of Coins
'Petitition' Crown is the Worlds Most Prestigious and Valuable Silver Coin
Hidden secret for all to see
Convex & Concave
The photo taken at an angle shows the bevel on the reverse
Simon was a man of creative illusions: he required extra depth of field to show
the King at his greatest.
It was not until recently that I could understand how it was possible to have a
medallic portrait on the coin, and keep the size and the correct silver weight. To
keep the obverse and the reverse of a quality to this day not surpassed, Simon, the
sculptor, created the magnificent reverse of the coin in a convex plane, just enough
to give the extra depth of field on the obverse to bring a three dimension look to the
King’s portrait.
Although I have not measured the extra depth on the reverse it is easily seen when
handling the coin; the edge dept is 3.5mm and thickness as the center of the coin is
4.5mm