Today I Found Out
      Why Do Some Coins Have Ridges? (2016x240)
      
      Udgivelsesdato: Nov 10, 2016
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https://www.youtube.com/user/TodayIFound→’s.  At this time, coins were actually made of materials that were worth what the coin was worth.  For example, a half dollar silver coin contained fifty cents worth of silver.  Likewise, a $10 gold coin contained $10 worth of gold.
Want the text version?: http://www.todayifoundout.com/index.php/2010/12/why-some-coins-have-ridges/
Sources:
http://ask.yahoo.com/20040621.html
http://www.bigsiteofamazingfacts.com/why-do-some-coins-have-ridges-around-the-edges
     
    
      
        
        
          
            - Premieret: Okt 2013
 
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