Not sure what your monitor size is ?
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1 turkish lira coin
2003 greece 100 euro commemorative coin
American nickel 2
Moeda um 1 real
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