Not sure what your monitor size is ?
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500 yen coin
Apple ipod nano 7th generation
Nexus one 2
Apple ipod 5th generation
just a teeny tiny bit too long like 4mm on a 17"
Perfect on a 19'' screen
i think mines bigger :P (i cba to go get it)
I checked it with my nano 3rd gen. It's pretty much exact. :-)