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I don't know how the rotation of coins are determined, but they surely are interesting. The United States and Canada work in opposite way when you flip a coin to the other side. Rotated horizontally, you would find that US coins should face up, while Canadian coins face down.
One interesting side factor about the rotation is that if a United States coin is flipped (say, horizontally) and the other side does not stand in the right direction, the coin had been produced as an error and is sought by coin collectors. The value would be determined by its face value and how "off" the other side is facing; for example, if you hold a quarter so George Washington's head is facing up and you flip it horizontally to find the eagle facing down, the coin would get its maximum value of around $50, if I recall properly.
Sorry for going off in my own world for a moment, I just find the world of numismatics so fascinating, couldn't resist 
Example of a ~30 degree rotatied die error:
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I think your wrong with the Canadian example all of the spare change in my room rotates horizontally, cool thread though.
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On May 31 2010 15:54 Antiochus wrote: I think your wrong with the Canadian example all of the spare change in my room rotates horizontally, cool thread though.
How can that be.... I am Canadian too.
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No idea, Canada dollar and 2 dollar both flip horizontally for me~
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That is pretty weird I just went though about 100 different coins ranging between the 60's to 2010 and all of them rotated horizontally. Maybe the coins rotate differently in different parts of the country I'm in Ontario where are you?
This doesn't make any sense at all.
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On May 31 2010 16:15 Antiochus wrote:That is pretty weird I just went though about 100 different coins ranging between the 60's to 2010 and all of them rotated horizontally. Maybe the coins rotate differently in different parts of the country  I'm in Ontario where are you? This doesn't make any sense at all.
OK I think I made a silly mistake on the terminologies (I blame 3:30AM). I was thinking about the axis of rotation being "vertical". Let me fix that....
Antiochus I am really sorry! Slap me 
On May 31 2010 16:24 eLiE wrote: my ontario coins all rotated horizontal as well. what a funny thread
The silliness was unintentional
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Aussie coins flip horizontally
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my ontario coins all rotated horizontal as well. what a funny thread
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Kentor
United States5784 Posts
uh this massachusetts quarter rotates vertically
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It flips horizontally
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everything but the american funny money seems to flip horizontally for me. canadian, czech crowns (old school!) and euros but everything i have in american is vertically. i blame their backwards imperial system!
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Danish kroner flips horizantally
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British pound also horizontal flippage.
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Horizontal rotation on the dutch euro coins (and also on a coin with a head stretching the limits of available space)
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japanese yen flips horizontally.
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Yen also has horizontal "flippage".
*edit, too slow
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how can u be not sure how the portuguese coin is in correct position?
Its written "portugal" on it......if thats in correct position(it is on ur pic) when the coin is in correct position.... do you fail to read the "portugal"?
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Also it seems like every coin flips horizontally, just not the american ones.... Like the metric system... Would be interesting to see how coins from myanmar or liberia since they also dont use the metric system
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