Always curious about the whereabouts of the Euro-bills; assisted by M., V. & W. and A.
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In 2007 & 2008 most of my notes are marked with a dot in the Omega (the last letter of the Greek word Euro) at the backside of the note.
In 2009 a dot in the O of the small word EURO at the backside; this mark is also valid for 2010 /2011/2012/2013 etc.