Not sure what your monitor size is ?
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20 polish groszy
2 swiss franc coin
50 pence coin
Pakistani 2 rupee coin
American 50 golden eagle
tiny bit smaller
It is almost similar to Singapore 10 cents coin
perfect at 18.5
It is perfect with a 20'' monitor.
Also Avalible At:http://pective.com/pic/3d-real-life-penny