Here's the 5 & 10 Euro notes I was looking for both from Greece, with the Duisenberg signature. You can tell they're from Greece due to the Y prefix:
(Fun?) facts about the first series of Euro banknotes:
The prefix indicates which National Central Bank ordered the notes. In this case, the €5 and the €10 were ordered by the Greek NCB.
However, the first series also has a printer code on the obverse.
It's N001B5 for the €5 note and F001B5 for the €10 note. The first letter indicates where the note was printed. 001B5 is the plate number and the position on the sheet.
N is the code for Greece -- meaning this €5 note was ordered by the Greek NCB AND printed in Greece. The F is code for ''Österreichische Banknoten- und Sicherheitsdruck GmbH,'' which means this €10 note was ordered by the Greek NCB. But it was printed in Austria by the Austrian national printer.
And yes, there are €10 notes which were ordered AND printed in Greece.
These days, Euro banknotes from Series 1 have (almost) completely disappeared from circulation. I haven't seen one in at least four or five years.
The second series of Euro banknotes, called the ''Europe series,'' does not have a code which NCB ordered the note.
Here, the serial number prefix indicates which company printed the note.